brass, ground and precision spur gears · reliance antibacklash gears have been developed over a...

Brass, Ground and Precision Spur Gears

Bra

ss, G

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dPr

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Spur

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Section Contents

Gear Range Overview ............................................................2

Precision Gears ........................................................................Page 46

Part Numbering ..................................................................Page 46

Antibacklash Pinions, Miniature ......................................Page 47

Antibacklash Pinions (pin and clamp hub) ....................Page 412

Antibacklash Gears (pin and clamp hub)........................Page 422

Spur Gears (pin and clamp hub) ......................................Page 436

Hubless Spur Gears ..........................................................Page 452

Hardened Spur Gears ........................................................Page 456

Ground Gears Overview ........................................................Page 460

Ground Spur Pinion Gear Shafts ......................................Page 461

Ground Pin Hub Spur Gears..............................................Page 462

Keys and Keyways..............................................................Page 469

Brass Gears and Pinions Overview........................................Page 470

Brass Pinions ......................................................................Page 471

Brass Pin Hub Spur Gears ................................................Page 472

Brass Hubless Spur Gears ................................................Page 478

Technical Information................................................................Page T41

ProductOverview

42

Precision Gears

Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

PrecisionG

ears

A complete precision gear rangeWith over 50 years of experience in the design and manufacture of precision spur gears, Reliance hasdeveloped an extensive range to suit a wide variety of customer applications. Alongside precision cutgears we offer hardened and precision ground gears for applications requiring higher load capacity anda very competitive range of brass gears for applications where there is a need to balance accuracy andload capacity against cost. Typical diameters range from 5 mm to 100 mm.

Precision cut gearsOur precision cut spur gear range offers antibacklash, spur, hubless and hardened gears with manyhundreds of thousands of combinations of bore size, face width, material, module and number of teeth.In line with our commitment to meeting customer requirements, any tooth number that can beconfigured for any given gear diameter can be supplied. This allows our customers ultimate flexibilitywhen selecting their gear ratio and the ability to use the smallest or most practical centre distance.

Gears are available in standard modules from 0.2–1.5, bore sizes from2–25 mm and to a minimum quality class of AQ10 (for definition ofAQ10 see page T41). Manufactured from aerospace standardstainless steel and aluminium alloy Reliance standard precision gearscan be specified for the most demanding applications. For customersthat require higher transmission accuracy, to measure position moreaccurately or extend life in high speed applications, all Reliance’sprecision gears are available up to quality AQ14.

For applications that require more torque transmission, a standard range of 174 PH, hardened tocondition H1025, is available. Further material choices are offered, commonly PEEK or acetal can bespecified where low noise and/or insulating properties are required. For other applicationspecificrequirements our engineers can help in the selection of exotic materials or add some customisationfeatures to the component.

Reliance antibacklash gears have been developed over a number of years and are manufactured witha twopiece construction. The fixed plate and hub are manufactured in one piece, which providesmaximum integrity when attaching the gear to a shaft. This manufacturing method is far superior whencompared to alternative antibacklash designs which use a threepiece construction, with the hub andfixed plate joined together by a metal deformation technique such as swaging or riveting.

Plain precision gears Antibacklash gears Hubless gears

ProductOverview

43

Precision Gears


Prec

isio

nG

earsOnline gear builderGear manufacture and test

Modification serviceReliance has a dedicated manufacturing cell wheremodifications can be carried out quickly andeconomically to customer specification. Typicallyweight reduction features or alternative fixing methodsare requested – please contact us to discuss yourrequirement.

Online gear builderFor fast, efficient and accurate selection of our precision cut gears we provide a gear builder facilitywhich is available to use online. The online selection process gives all the required technical andcommercial information appropriate to the gear specification, including a 3D image, drawing, partdescription and item number, together with the price and delivery lead time.

Precision ground gearsThe precision ground spur gear range, manufactured from chromium molybdenum steel hardened to4955 HRc, and with tooth profiles manufactured to ISO grade 5, is ideal for higher loaded, mechatronicapplications. Available from stock or on short delivery the bore and the faces of the gears are purposelyleft soft to enable quick modification to suit alternative fixing or shaft diameter requirements.

Brass gearsThe brass spur gear range is also available from stock or on a short delivery and provides customerswith an economical alternative for less demanding applications. Manufactured from high grade brass,ISO CuZn39Pb3, the standard range of spur gears also includes pinion shafts with tooth numbers aslow as 10 and a small range of internal gears (see page 515).

ProductOverview

44

Precision Gears


PrecisionG

ears

Design and manufacture of custom gears

Alongside our extensive range of standard catalogue gears Reliance also designs and manufacturesbespoke gears to customers’ requirements. Reliance has over 50 years of experience in gearing,ranging from high accuracy, long life applications such as radar and optical payload applications, to veryshort life highly loaded aerospace applications.

Gear specialists at Reliance are very happy to offer adviceon the design strategy for custom gears and can help withdatum positioning and dimensioning to achieve the bestpossible accuracy at the most economical cost. Forexample, simply utilising the mounting feature of the gear asthe datum for the gear cutting operation avoids unnecessarytolerance build ups and interim manufacturing operations.

Reliance’s engineers have a detailed knowledge of theprinciples of gear tooth generation and the resulting contactconditions. This enables them to work with engineers inother industries to offer advice on the modification of gearteeth to provide bespoke contact conditions that enhancethe performance of the gear pair, or to achieve an imposedcentre distance within the constraints of the designenvironment.

Typical market areas are aerospace, space, defence and downhole instrumentation whereperformancecritical applications demand a deep understanding of gear geometry. Both external,internal and combination gears can be manufactured using high accuracy hobbing and shapingmachines with a module range of between 0.2 to 1.5 module and a diameter range from 2 to 330 mm.

Custom gears can be manufactured from a range of materials such as, but not limited to, stainless steel,aluminium alloy, precipitation hardening steel, phosphor bronze, titanium and other speciality metals, aswell as high performance polymers such as PEEK. Reliance also works very closely with accredited andformally approved surface coating and heat treatment specialists to provide most industry standardprocesses.

During manufacturing all gears are individually inspectedfor gear quality and size using a dual flank inspectionprocess with maximum accuracies of 3 microns toothtotooth and 5 microns total composite error. For demandingapplications gears are inspected for lead, pitch and profileon our Klingelnberg P40 gear measuring machine.

Our expertise also extends to the associatedstructure in geared assemblies where we can providedesign for manufacture advice or a full design fromspecification service. Typical projects can involve conceptdesign, development testing, prototype manufacture,performance validation testing and productionmanufacture with final acceptance testing, see page 328.

ProductOverview

45

Precision Gears


Prec

isio

nG

ears

Gear testing

Custom gear manufacture

Gear deburring

Custom gear design and development

Wear and coating life testGear metrology

Satellite gear, manufactured for SSTL, working in orbit

ReferenceGuide

46

Precision Gear Part Numbering


PrecisionG

ears

AP 05 S1 B4 F45 A 55 B

Pin hubClamp hubHublessAntibacklash pin hubAntibacklash clamp hubAntibacklash clamp hub,

miniature

PCF

APAC

AR

Gear Type

PitchModule1.51.251.00.80.60.50.40.30.250.21 mmCP2 mmCP2.5 mmCP

150125

100806 050403

025021M2M

25M

Material CodeAluminium alloyStainless steel 303Stainless steel 316Hardened stainlesssteel 174PHBrassAcetalPEEK polymer

A1S1S2#

S8B2#

D1#

P1#

BoreMetric2 mm3 mm4 mm5 mm6 mm8 mm10 mm12 mm15 mm

B2B3B4B5B6B8B10B12B15

Imperial5/64"1/8"0.12"3/16"1/4"5/16"3/8"11/16"1"

B078#

B125#

B120#

B187#

B250#

B312#

B375#

B687#

B1000#

Face Width2 mm3 mm3.3 mm3.5 mm4 mm4.5 mm5 mm6 mm6.5 mm7 mm8 mm8.9 mm10 mm12 mm

F2F3F33F35F4F45F5F6F61F7F8F89F10F12

Dra

win

g Is

sue

Sepa

rato

rN

umbe

r of T

eeth

Gear QualityAQ14AQ12AQ11AQ10 (leave blank)*

ABC

*Standard accuracyAQ10 (1.25 Mod, 20DPor finer), AQ9 (1.5 Mod,16 DP or coarser).

DP16203248647280961001201/10 "CP1/20 "CP

16#

20#

32#

48#

64#

72#

80#

96#

100#

120#

31#

62#

# indicates nonstandard items. Please enquire for details regarding large modules, imperial pitches and bores, andalternative materials.Part numbering information on this page refers to the precision gears from pagse 47 to 459.

2 mm Bore

47

AntiBacklash PinionsMiniature


Prec

isio

nG

ears

All dimensions in mmGeneral tolerances ±0.13 mm

Pressure angle 20°

Part number selection table

Example Part No: AR06S1B2F33A 25

StandardModules

Basic Part NumberStandard Materials

Number of Teeth

Min MaxStainless Steel Aluminium Alloy0.80.60.50.40.30.250.2

AR08S1B2F33AAR06S1B2F33AAR05S1B2F33AAR04S1B2F33AAR03S1B2F33AAR025S1B2F33AAR02S1B2F33A

AR08A1B2F33AAR06A1B2F33AAR05A1B2F33AAR04A1B2F33AAR03A1B2F33AAR025A1B2F33AAR02A1B2F33A

16 †212430384556

21293645617493

† Gears of 16 teeth will be modified see page T48

Associated ProductsClamp hub gears: page 436 to 450Shafts: page 112Bearings: page 121Gear clamps: page 114

Features and options Technical support• Gear quality AQ10 as standard see page T41• Higher gear qualities available see page T41• Imperial gears available• For all gear types and options see page 46• Product overview see pages 42 to 46

• Material specifications see page T44• Lubrication see page T410• Installation information see page T49• Treatment specifications see page T44• Technical information see pages T41 to T418• For modified or fully bespoke gear solutions,

please contact us

3 mm Bore

48



PrecisionG

ears

Associated ProductsClamp hub gears: page 436 to 450

Shafts: page 112Bearings: page 121

Gear clamps: page 114

All dimensions in mmGeneral tolerances ±0.13 mmPressure angle 20°



StandardModules


Number of Teeth




16 †212430384556

21293645617493

† Gears of 16 teeth or fewer will be modified see page T48



please contact us

4 mm Bore

49



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




18222632414960

21293645617493



please contact us

5 mm Bore

410



PrecisionG

ears







StandardModules


Number of Teeth




19242834445265

21293645617493



please contact us

6 mm Bore

411



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




21263138495872

21293645617493



please contact us

2 mm Bore

412

AntiBacklash Clamp Hub Pinions


PrecisionG

ears






Example Part No: AC06S1B2F45A 35

StandardModules


Number of Teeth

Min MaxStainless Steel Aluminium Alloy1.51.251.00.80.60.50.40.30.250.2

AC150S1B2F45AAC125S1B2F45AAC10S1B2F45AAC08S1B2F45AAC06S1B2F45AAC05S1B2F45AAC04S1B2F45AAC03S1B2F45AAC025S1B2F45AAC02S1B2F45A

AC150A1B2F45AAC125A1B2F45AAC10A1B2F45AAC08A1B2F45AAC06A1B2F45AAC05A1B2F45AAC04A1B2F45AAC03A1B2F45AAC025A1B2F45AAC02A1B2F45A

14 †16 †1923293442556580

22273544597290

121146183


Features and options Technical support• Gear quality AQ10 as standard see page T41• Gear quality AQ9 for 1.5 mod• Higher gear qualities available see page T41• Imperial gears available• For all gear types and options see page 46• Product overview see pages 42 to 46


please contact us

2 mm Bore

413

AntiBacklash Pin Hub Pinions


Prec

isio

nG

ears


Pressure angle 20°

Associated ProductsPin hub gears: page 437 to 451Shafts: page 112Bearings: page 121Pins: page 1318


Example Part No: AP06S1B2F45A 35

StandardModules


Number of Teeth


AP150S1B2F45AAP125S1B2F45AAP10S1B2F45AAP08S1B2F45AAP06S1B2F45AAP05S1B2F45AAP04S1B2F45AAP03S1B2F45AAP025S1B2F45AAP02S1B2F45A

AP150A1B2F45AAP125A1B2F45AAP10A1B2F45AAP08A1B2F45AAP06A1B2F45AAP05A1B2F45AAP04A1B2F45AAP03A1B2F45AAP025A1B2F45AAP02A1B2F45A

14 †16 †1923293442556580

22273544597290

121146183




please contact us

3 mm Bore

414



PrecisionG

ears







StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

3 mm Bore

415



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

4 mm Bore

416



PrecisionG

ears







StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

4 mm Bore

417



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

5 mm Bore

418



PrecisionG

ears







StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

5 mm Bore

419



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

6 mm Bore

420



PrecisionG

ears







StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

6 mm Bore

421



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




14 †16 †1923293442556580

22273544597290

121146183




please contact us

2 mm Bore

422

AntiBacklash Clamp Hub Gears


PrecisionG

ears







StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

2 mm Bore

423

AntiBacklash Pin Hub Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

3 mm Bore

424



PrecisionG

ears







StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

3 mm Bore

425



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

4 mm Bore

426



PrecisionG

ears







StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

4 mm Bore

427



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

5 mm Bore

428



PrecisionG

ears







StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

5 mm Bore

429



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

6 mm Bore

430



PrecisionG

ears







StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

6 mm Bore

431



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




24283442556681

107128159

46567088

119143179240289361



please contact us

8 mm Bore

432



PrecisionG

ears







StandardModules


Number of Teeth




2125303748567092

110136

7591

114143192230289386463580



please contact us

8 mm Bore

433



Prec

isio

nG

ears


Pressure angle 20°




StandardModules


Number of Teeth




2125303748567092

110136

7591

114143192230289386463580



please contact us

10 mm Bore

434



PrecisionG

ears




All dimensions in mmGeneral tolerances ±0.13mmPressure angle 20°



StandardModules


Number of Teeth




2125303748567092

110136

7591

114143192230289386463580



please contact us

10 mm Bore

435



Prec

isio

nG

ears

All dimensions in mmGeneral tolerances ±0.13mm

Pressure angle 20°




StandardModules


Number of Teeth




2125303748567092

110136

7591

114143192230289386463580



please contact us

2 mm Bore

436

Clamp Hub Spur Gears


PrecisionG

ears


† Gears of 16 teeth or fewer will be modified see page T48# Alternative materials replace S1 in the part number with B2 for brass

Example Part No: C06S1B2 F2A 25

StandardModules

Basic Part NumberStandard Materials #

Face Width Number of Teeth

Dim F Min MaxStainlessSteel

AluminiumAlloy F2A F4A

1.51.251.00.80.60.50.40.30.250.2

C150S1B2C125S1B2C10S1B2C08S1B2C06S1B2C05S1B2C04S1B2C03S1B2C025S1B2C02S1B2

C150A1B2C125A1B2C10A1B2C08A1B2C06A1B2C05A1B2C04A1B2C03A1B2C025A1B2C02A1B2

F2A (2 mm)

or

F4A (4 mm)

12 †12 †12 †13 †14 †14 †15 †171820

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=7F=4, L=9

Associated ProductsAntibacklash gears: page 47 to 434





please contact us

2 mm Bore

437

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°

Associated ProductsAntibacklash gears: page 413 to 435Shafts: page 112Bearings: page 121Pins: page 1318

† Gears of 16 teeth or fewer will be modified see page T48# Alternative materials replace S1 in the part number with B2 for brass, or S8 for hardened stainless steel

Example Part No: P06S1B2 F2A 25

StandardModules





1.51.251.00.80.60.50.40.30.250.2

P150S1B2P125S1B2P10S1B2P08S1B2P06S1B2P05S1B2P04S1B2P03S1B2P025S1B2P02S1B2

P150A1B2P125A1B2P10A1B2P08A1B2P06A1B2P05A1B2P04A1B2P03A1B2P025A1B2P02A1B2

F2A (2 mm)

or

F4A (4 mm)

12 †12 †12 †13 †15 †1821273138

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=7F=4, L=9



please contact us

3 mm Bore

438



PrecisionG

ears




StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A ( 2 mm)

or

F4A (4 mm)

12 †13 †13 †14 †15 †16 †18202225

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=7F=4, L=9






please contact us

3 mm Bore

439

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A (2 mm)

or

F4A (4 mm)

12 †13 †13 †14 †172023303543

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=7F=4, L=9



please contact us

4 mm Bore

440



PrecisionG

ears







StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A (2 mm)

or

F4A (4 mm)

13 †14 †14 †15 †171820242630

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=9F=4, L=11



please contact us

4 mm Bore

441

Pin Hub Spur Gears


Prec

isio

nG

ears

All dimensions in mm General tolerances ±0.13 mm

Pressure angle 20°




StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A (2 mm)

or

F4A (4 mm)

13 †14 †14 †15 †192226343948

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=8F=4, L=10



please contact us

5 mm Bore

442



PrecisionG

ears







StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A (2 mm)

or

F4A (4 mm)

14 †14 †15 †17192023273035

21253241566785

114137172

7286

109136183220275368442553


when F=2, L=9F=4, L=11



please contact us

5 mm Bore

443

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules





1.51.251.00.80.60.50.40.30.250.2



F2A (2 mm)

or

F4A (4 mm)

14 †14 †15 †17212429374353

21253241566785

114137172

7286

109136183220275368442553


when F=2, L=8F=4, L=10



please contact us

6 mm Bore

444



PrecisionG

ears







StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F3A (3 mm)

or

F4A (4 mm)

or

F6A (6 mm)

14 †15 †16 †18202225303440

7286

109136183220275368442553


When F=3, L=10F=4, L=11F=6, L=13



please contact us

6 mm Bore

445

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°





StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F3A (3 mm)

or

F4A (4 mm)

or

F6A (6 mm)

14 †15 †16 †19232733435062

7286

109136183220275368442553

When F=3, L=9F=4, L=10F=6, L=12



please contact us

8 mm Bore

446



PrecisionG

ears





† Gears of 16 teeth will be modified see page T48# Alternative materials replace S1 in the part number with B2 for brass


StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F4A (4 mm)

or

F6A (6 mm)

16 †171820242630374250

7286

109136183220275368442553


When F=4, L=13F=6, L=15



please contact us

8 mm Bore

447

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°


† Gears of 16 teeth will be modified see page T48# Alternative materials replace S1 in the part number with B2 for brass, or S8 for hardened stainless steel



StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F4A (4 mm)

or

F6A (6 mm)

16 †172024303543566682

7286

109136183220275368442553

When F=4, L=10F=6, L=12



please contact us

10 mm Bore

448



PrecisionG

ears






StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F4A (4 mm)

or

F6A (6 mm)

17182023273035445060

7286

109136183220275368442553


When F=4, L=13F=6, L=15

# Alternative materials replace S1 in the part number with B2 for brass



please contact us

10 mm Bore

449

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F4A (4 mm)

or

F6A (6 mm)

17192227344050657795

7286

109136183220275368442553

When F=4, L=12F=6, L=14

# Alternative materials replace S1 in the part number with B2 for brass, or S8 for hardened stainless steel



please contact us

12 mm Bore

450



PrecisionG

ears






StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F6A ( 6mm)

or

F10A (10 mm)

18202225303440505870

7286

109136183220275368442553


When F=6, L=15F=10, L=19

# Alternative materials replace S1 in the part number with B2 for brass



please contact us

12 mm Bore

451

Pin Hub Spur Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F8A (8 mm)

or

F12A (12 mm)

192226324148597792

113

7286

109136183220275368442553

When F=8, L=20F=12, L=24

# Alternative materials replace S1 in the part number with B2 for brass, or S8 for hardened stainless steel



please contact us

5 mm Bore

452

Hubless Spur Gears


PrecisionG

ears


Shafts: page 112


† Gears of 16 teeth or fewer will be modified see page T48# Alternative materials replace S1 in the part number with B2 for brass, D1 for Delrin or S8 for hardened stainlesssteel

Example Part No: F06S1B5 F3A 75

StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2

F150S1B5F125S1B5F10S1B5F08S1B5F06S1B5F05S1B5F04S1B5F03S1B5F025S1B5F02S1B5

F150A1B5F125A1B5F10A1B5F08A1B5F06A1B5F05A1B5F04A1B5F03A1B5F025A1B5F02A1B5

F3A (3 mm)

or

F6A (6 mm)

14 †14 †15 †17192023273035

7286

109136183220275368442553


NoteDelrin gear boreØ5.02/4.97



please contact us

10 mm Bore

453

Hubless Spur Gears


Prec

isio

nG

ears


Pressure angle 20°

Associated ProductsAntibacklash gears: page 47 to 435Shafts: page 112



StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F3A (3 mm)

or

F6A (6 mm)

17182023273035445060

7286

109136183220275368442553

# Alternative materials replace S1 in the part number with B2 for brass, D1 for Delrin or S8 for hardened stainlesssteel




please contact us

15 mm Bore

454

Hubless Spur Gears


PrecisionG

ears




StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F3A (3 mm)

or

F6A (6 mm)

20222529354048607085

7286

109136183220275368442553






please contact us

25 mm Bore

455

Hubless Spur Gears


Prec

isio

nG

ears


Pressure angle 20°




StandardModules




AluminiumAlloy

1.51.251.00.80.60.50.40.30.250.2



F3A (3 mm)

or

F6A (6 mm)

2730354252607394

110135

7286

109136183220275368442553





please contact us

5 mm Bore

456

Hardened Spur Gears


PrecisionG

ears

Associated ProductsPin hub spur gears: page 437 to 451


Pins: page 1318

All dimensions in mmGeneral tolerances ±0.13 mmMaterial: Stainless steel 174 PH,hardened to 3542 HRcPressure angle 20°



StandardModules

Basic Part Number Face Width Number of TeethHardenedStainless

SteelDim F Min Max

F2A F4A1.51.251.00.80.60.50.40.30.250.2


F2A (2 mm)

or

F4A (4 mm)

14 †14 †15 †17212429374353

21253241566785

114137172

7286

109136183220275368442553


When F=2, L=8F=4, L=10

Features and options Technical support• Gear quality AQ10 as standard see page T41• Gear quality AQ9 for 1.5 mod• Higher gear qualities available see page T41• Additional bore sizes 2 mm to 12 mm available• Imperial gears available• For all gear types and options see page 46• Product overview see pages 42 to 46


please contact us

6 mm Bore

457

Hardened Spur Gears


Prec

isio

nG

ears


Material: Stainless steel 174 PH,hardened to 3542 HRc

Pressure angle 20°

Associated ProductsPin hub spur gears: page 437 to 451Shafts: page 112Bearings: page 121Pins: page 1318



StandardModules


SteelDim F Min Max

1.51.251.00.80.60.50.40.30.250.2


F3A (3 mm)

or

F4A (4 mm)

or

F6A (6 mm)

14 †15 †16 †19232733435062

7286

109136183220275368442553


When F=3, L=9F=4, L=10F=6, L=12



please contact us

8 mm Bore

458

Hardened Spur Gears


PrecisionG

ears

Associated ProductsPin hub spur gears: page 437 to 451


Pins: page 1318

All dimensions in mmGeneral tolerances ±0.13 mmMaterial: Stainless steel 174 PH,hardened to 3542 HRcPressure angle 20°



StandardModules


SteelDim F Min Max

1.51.251.00.80.60.50.40.30.250.2


F4A (4 mm)

or

F6A (6 mm)

16 †172024303543566682

7286

109136183220275368442553


When F=4, L=10F=6, L=12



please contact us

10 mm Bore

459

Hardened Spur Gears


Prec

isio

nG

ears


Material: Stainless steel 174 PH,hardened to 3542 HRc

Pressure angle 20°

Associated ProductsPin hub spur gears: page 437 to 451Shafts: page 112Bearings: page 121Pins: page 1318


StandardModules


SteelDim F Min Max

1.51.251.00.80.60.50.40.30.250.2


F4A (4 mm)

or

F6A (6 mm)

17192227344050657795

7286

109136183220275368442553


When F=4, L=12F=6, L=14



please contact us

ProductOverview

460

Ground Spur Gears


PrecisionG

ears

SG 50 S 50 B 10 08

GearType

Module Material Number ofTeeth

ShaftType

BoresTypes*

FaceWidth

BoreDiameter

Ground SpurGear

0.5 500.8 801.0 1

ChromiumMolybdenumSteel 4955HRc

14 120 L = solid shafton both sidesB = Bore withhub on oneside

Ground borewithoutthreaded hole+ Ground borewith threadedhole and subdrilled hole,set screw notsupplied

810

05 506 608 810 1012 12

Ground spur gears

Ground spur gears are ideal for high speed mechatronic applications where higher loads andaccurate motion are required.

• Modules 0.5 to 1.0 available.• Manufactured from chromium molybdenum

steel, hardened to 4955HRc.• Standard gear quality: ISO 5• Bore diameter, outside diameter and other

surfaces are ground to provide locationdatums when additional machining isrequired. Additional machining of the boreis not recommended.

• Keyway features available see page 469

* See bore type designator in part number, or +

Part number structure

0.5, 0.8, 1.0Module

461

Ground Spur Pinion Gear Shafts


Prec

isio

nG

ears

All dimensions in mmPressure angle 20°

Associated ProductsBearings: page 121

PartNumber

Module Numberof

Teeth

PCD

Ød

OD

Øda

FaceWidth

F

ShaftDia(h7)ØA

ShaftLength

LL

ShaftLength

LR

OverallLength

LSG50S20L0806SG50S22L0808SG50S24L0810SG50S25L0810SG50S26L0810

0.5

2022242526

10.011.012.012.513.0

11.012.013.013.514.0

8

68

101010

22 50 80

SG80S15L0806SG80S16L0806SG80S18L0808SG80S20L0810SG80S24L0810SG80S25L0810

0.8

151618202425

12.012.814.416.019.220.0

13.614.416.017.620.821.6

8

668

101010

22 60 90

SG1S14L1008SG1S15L1010SG1S16L1010SG1S18L1010

1.0

14151618

14.015.016.018.0

16.017.018.020.0

10

8101010

25 60 95


Features Technical support• Material: Chromium molybdenum steel

(ISO 34CrMo4, 42CrMo4)• Gear tooth treatment: Induction hardened to

4955 HRc• Gear quality: ISO 5• Gear tooth surface finish

• For transmission capacity see page T417• Part number structure see page 460• Small quantities of selected items available

exstock, please visit our online store:www.reliance.co.uk/shop

• For modified or fully bespoke gears, pleasecontact us

0.5 Module

462

Ground Pin Hub Spur Gears


PrecisionG

ears

Associated ProductsSet screws: page 131



PartNumber

Numberof

Teeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG50S28B0805SG50S30B0805SG50S30B0806SG50S30B*0806SG50S32B0805SG50S32B0806SG50S35B0805SG50S36B0806SG50S36B0808SG50S40B0806SG50S40B0808SG50S40B*0808SG50S45B0808SG50S48B0808SG50S50B0808SG50S50B0810SG50S50B*0810SG50S54B0808SG50S55B0808

28303030323235363640404045485050505455

14.015.015.015.016.016.017.518.018.020.020.020.022.524.025.025.025.027.027.5

15.016.016.016.017.017.018.519.019.021.021.021.023.525.026.026.026.028.028.5

556656568688888

1010

88

10121212121214161616161616202020202020

8 16

M3

M4

M4

444


* in part number denotes two threadedholes (set screws not supplied)

in part number denotes nothreaded hole



4955 HRc• Gear quality: ISO 5• Gear tooth surface finish• Keyway features available see page 469




0.5 Module

463



Prec

isio

nG

ears

All dimensions in mmPressure angle 20

Associated ProductsSet screws: page 131Shafts: page 112Bearings: page 121

Part number selection tablePart

NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG50S56B0808SG50S60B0808SG50S60B0810SG50S60B*0810SG50S64B0808SG50S70B0808SG50S72B0808SG50S75B0808SG50S80B0808SG50S80B0810SG50S80B0812SG50S80B*0812SG50S90B0810SG50S96B0810SG50S100B0810SG50S100B0812SG50S100B*0812SG50S108B0810SG50S112B0810SG50S120B0810

5660606064707275808080809096

100100100108112120

28.030.030.030.032.035.036.037.540.040.040.040.045.048.050.050.050.054.056.060.0

29.031.031.031.033.036.037.038.541.041.041.041.046.049.051.051.051.055.057.061.0

88

1010

88888

1012121010101212101010

2022222222222525252525253030303030353535

8 16

M4

M5

M5

444









0.8 Module

464



PrecisionG

ears





NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG80S22B0806SG80S24B0806SG80S25B0806SG80S28B0808SG80S30B0810SG80S30B*0810SG80S32B0810SG80S35B0810SG80S36B0810SG80S40B0810SG80S40B*0812SG80S45B0810SG80S48B0810SG80S50B0810SG80S50B*0812SG80S54B0810SG80S55B0810

2224252830303235364040454850505455

17.619.220.022.424.024.025.628.028.832.032.036.038.440.040.043.244.0

19.220.821.624.025.625.627.229.630.433.633.637.640.041.641.644.845.6

6668

10101010101012101010121010

1416161820202020202525252525252525

8 18

M4

M5

M5

555









0.8 Module

465



Prec

isio

nG

ears




NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG80S56B0810SG80S60B0810SG80S60B*0812SG80S64B0812SG80S70B0812SG80S72B0812SG80S75B0812SG80S80B0812SG80S90B0812SG80S96B0812SG80S100B0812SG80S108B0812SG80S112B0812SG80S120B0812

56606064707275809096

100108112120

44.848.048.051.256.057.660.064.072.076.880.086.489.696.0

46.449.649.652.857.659.261.665.673.678.481.688.091.297.6

1010121212121212121212121212

2525253030303030353535404040

8 18

M5

5









1.0 Module

466



PrecisionG

ears





NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG1S17B1006SG1S18B1008SG1S20B1008SG1S20B*1008SG1S20B*1010SG1S21B1008SG1S22B1008SG1S23B1008SG1S24B1008SG1S24B*1008SG1S24B*1010SG1S25B1008SG1S26B1008SG1S27B1008SG1S28B1008SG1S30B1010SG1S30B*1010

1718202020212223242424252627283030

17.018.020.020.020.021.022.023.024.024.024.025.026.027.028.030.030.0

19.020.022.022.022.023.024.025.026.026.026.027.028.029.030.032.032.0

6888

1088888

108888

1010

1215161616161818202020202020202626

10 20

M4M4

M4M4

M4

55555









1.0 Module

467



Prec

isio

nG

ears




NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MSG1S30B*1012SG1S32B1010SG1S34B1010SG1S35B1010SG1S36B1010SG1S38B1010SG1S40B1010SG1S40B1012SG1S42B1010SG1S44B1010SG1S45B1012SG1S48B1012SG1S50B1012

30323435363840404244454850

30.032.034.035.036.038.040.040.042.044.045.048.050.0

32.034.036.037.038.040.042.042.044.046.047.050.052.0

12101010101010121010121212

26262626262626263535353535

10 20

M4

5









1.0 Module

468



PrecisionG

ears





NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H7)ØB

HubDia

ØA

FaceWidth

F

OverallLength

LSG1S52B1012SG1S54B1012SG1S55B1012SG1S56B1012SG1S60B1012SG1S64B1012SG1S70B1012SG1S72B1012SG1S75B1012SG1S80B1012SG1S100B1012

52545556606470727580

100

52.054.055.056.060.064.070.072.075.080.0

100.0

54.056.057.058.062.066.072.074.077.082.0

102.0

12

3535353540404045454550

10 20








Keys andKeyways

469



Prec

isio

nG

ears

All dimensions in mmAssociated ProductsGround pin hub spur gears: page 462

Bore DiaØ

Keywayb2 x t2

Width Depthb2 Tolerance Js 9 t2 Tolerance

8 3 x 1.4 3 ±0.0125 1.4 +0.1010

12 4 x 1.8 4 ±0.015 1.8

b x t 3 x 3 4 x 4b Tolerance (h) h9 h9t Tolerance (h) h9 h9

Keyway information

Tolerances for key

Features• The keyways above are available as options, add K to the end of the part number• Additional custom keyways are available, please contact us

ProductOverview

470

Brass Gears and Pinions


PrecisionG

ears

S 50 B 20 K + 02 03

GearType

Module Material Number ofTeeth

ShaftTypes

BoreTypes

FaceWidth

BoreDiameter

Spur Gear 0.3 300.5 500.75 75

Brass 8 120 A Hublesswith boreB Bore withhub on onesideK Pinionshaft

Gear shaft + Gear shaftwith bore andthreaded hole,set screw notsupplied

2 023 034 048 0810 10

2 023 035 056 068 0812 1215 15

Brass gears

Brass gears are ideal for lightly loaded applications, an economic balance of accuracy and loadcapacity against cost.

• Modules 0.3 to 0.75 available• Manufactured from brass

(ISO CuZn38Pb2, CuZn39Pb3)• Standard gear quality: ISO 9 10

Part number structure

Additional brass gears are available in the precision gear range see page 46

0.3, 0.5, 0.75Module

471

Brass Pinions


Prec

isio

nG

ears



PartNumber

Module Numberof

Teeth

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS30B14K+0402S30B15K+0402S30B16K+0402S30B18K+0402

0.3

14151618

4.24.54.85.4

4.85.15.46.0

2

5.05.55.56.0

4

12121212

M1.6M1.6M1.6M2

2.52.52.52.5

S50B10K1006S50B12K1007S50B14K1008S50B15K+0803S50B16K+0803S50B18K+0803S50B20K+0803

0.5

10121415161820

5.06.07.07.58.09.0

10.0

6.07.08.08.59.0

10.011.0

3333

6.07.08.09.09.0

10.011.0

1010108888

55555518181818

M3M3M3M3

3.03.03.03.0

S75B10K0809S75B12K0811S75B14K+0805S75B15K+0805S75B16K+0805S75B18K+0805S75B20K+0805

0.75

10121415161820

7.59.0

10.511.2512.013.515.0

9.010.512.012.7513.515.016.5

55555

9.011.012.012.7513.515.016.5

8

55552020202020

M3M3M3M3M3

3.03.03.03.03.0


Shaft Pinion

Pinion

set screw not supplied

in part number denotes shaft pinion type

Features Technical support• Material: Brass (ISO CuZn39Pb3)• Gear quality: ISO 9 10• Small quantities of selected items available


• Allowable backlash see page T417• For modified or fully bespoke gears, please

contact us• Product overview see page 470

0.3 Module

472

Brass Pin Hub Spur Gears


PrecisionG

ears




PartNumber

Numberof

Teeth

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS30B20B+0302S30B24B+0302S30B25B+0302S30B28B+0302S30B30B+0302S30B32B+0202S30B35B+0202S30B36B+0203S30B40B+0203S30B45B+0203S30B48B+0203

2024252830323536404548

6.07.27.58.49.09.6

10.510.812.013.514.4

6.67.88.19.09.6

10.211.111.412.614.115.0

22222223333

56678889

101010

3.23.23.23.23.22.02.02.02.02.02.0

8

M1.6M2M2M2M2M2M2M3M3M3M3

2.52.52.52.52.53.03.03.03.03.03.0

Part number selection table set screw not supplied





0.3 Module

473



Prec

isio

nG

ears




NumberNumber

ofTeeth

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS30B50B+0203S30B56B+0203S30B60B+0203S30B64B+0203S30B66B+0203S30B70B+0203S30B72B+0203S30B75B+0203S30B80B+0203S30B90B+0203S30B96B+0203S30B100B+0203S30B108B+0203

5056606466707275809096

100108

15.016.818.019.219.821.021.622.524.027.028.830.032.4

15.617.418.619.820.421.622.223.124.627.629.430.633.0

3 10 2 8 M3 3






0.5 Module

474



PrecisionG

ears




PartNumber

Numberof

Teeth

Type PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS50B20B+0303S50B24B+0303S50B25B+0303S50B26B+0303S50B28B+0303S50B30B+0303S50B32B+0303S50B35B+0303S50B36B+0303S50B40B+0203S50B42B+0203S50B45B+0203S50B48B+0203S50B50B+0203S50B55B+0203S50B56B+0203S50B58B+0203S50B60B+0203

202425262830323536404245485055565860

B1B1B1B1B1B1B1B1B1B2B2B2B2B2 B2B2B2B2

10.012.012.513.014.015.016.017.518.020.021.022.524.025.027.528.029.030.0

11.013.013.514.015.016.017.018.519.021.022.023.525.026.028.529.030.031.0

3

8.210.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.0

333333333222222222

888888888

7.57.57.57.57.57.57.57.57.5

M3 2.5


Type B1 Gear Type B2 Gear


Type B2 gears have riveted hub

Features Technical support• Material: Brass (ISO CuZn38Pb2, CuZn39Pb3)• Gear quality: ISO 9 10• Small quantities of selected items available




0.5 Module

475



Prec

isio

nG

ears




Type B2 Gear







PartNumber

Numberof

Teeth

Type PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS50B62B+0203S50B64B+0203S50B65B+0203S50B68B+0203S50B70B+0203S50B72B+0203S50B75B+0203S50B80B+0203S50B84B+0203S50B85B+0203S50B90B+0203S50B95B+0203S50B100B+0203S50B105B+0203S50B110B+0203

626465687072758084859095

100105110

B2B2B2B2B2 B2B2B2B2B2B2B2B2B2B2

31.032.032.534.035.036.037.540.042.042.545.047.550.052.555.0

32.033.033.535.036.037.038.541.043.043.546.048.551.053.556.0

3

10.010.010.010.010.010.010.010.010.010.010.010.015.015.015.0

2

7.57.57.57.57.57.57.57.57.57.57.57.59.59.59.5

M3

2.52.52.52.52.52.52.52.5 2.52.52.52.53.53.53.5

0.75 Module

476



PrecisionG

ears




PartNumber

Numberof

Teeth

Type PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS75B16B+0305S75B18B+0305S75B20B+0306S75B24B+0306S75B25B+0306S75B26B+0306S75B28B+0306S75B30B+0306S75B32B+0306S75B35B+0306S75B36B+0306S75B40B+0306S75B42B+0306S75B45B+0306S75B48B+0306S75B50B+0306S75B55B+0306S75B56B+0306S75B58B+0306

16182024252628303235364042454850555658

B1B1B1B1B1B1B1B1B1B1B1B1B1B1 B1B2B2B2B2

12.013.515.018.018.7519.521.022.524.026.2527.030.031.533.7536.037.541.2542.043.5

13.515.016.519.520.2521.022.524.025.527.7528.531.533.035.2537.539.042.7543.545.0

5566666666666666666

10.011.012.014.014.014.014.015.015.018.018.020.020.020.020.020.020.020.020.0

3

10.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.510.510.510.5

M3M3M4M4M4M4M4M4M4M4M4M4M4M4M4M4M4M4M4

3.5


Type B1 Gear Type B2 Gear







0.75 Module

477



Prec

isio

nG

ears




Type B2 Gear







PartNumber

Numberof

Teeth

Type PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MS75B60B+0306S75B62B+0306S75B64B+0306S75B65B+0306S75B66B+0306S75B68B+0306S75B70B+0306S75B72B+0306S75B75B+0306S75B80B+0306S75B85B+0306S75B90B+0306S75B95B+0306S75B100B+0306S75B105B+0306S75B110B+0306S75B115B+0306S75B120B+0306

60626465666870727580859095

100105110115120

B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2

45.046.548.048.7549.551.052.554.056.2560.063.7567.571.2575.078.7582.586.2590.0

46.548.049.550.2551.052.554.055.557.7561.565.2569.072.7576.580.2584.087.7591.5

6 20.0 3 10.5 M4 3.5

0.5 Module

478

Brass Hubless Spur Gears


PrecisionG

ears

Associated ProductsGears: page 41

Shafts: page 112


PartNumber

Numberof

Teeth

PCD

Ød

OD

Øda

FaceWidth

F

BoreDiaØB

S50B40A0208S50B42A0208S50B45A0208S50B48A0208S50B50A0208S50B55A0208S50B56A0208S50B58A0208S50B60A0208S50B62A0208S50B64A0208S50B65A0208

404245485055565860626465

20.021.022.524.025.027.528.029.030.031.032.032.5

21.022.023.525.026.028.529.030.031.032.033.033.5

2 8






0.5 Module

479



Prec

isio

nG

ears


Associated ProductsGears: page 41Shafts: page 112


NumberNumber

ofTeeth

PCD

Ød

OD

Øda

FaceWidth

F

BoreDiaØB


687072758084859095

100105110

34.035.036.037.540.042.042.545.047.550.052.555.0

35.036.037.038.541.043.043.546.048.551.053.556.0

2

888888888

121212





0.75 Module

480



PrecisionG

ears



PartNumber

Numberof

Teeth

PCD

Ød

OD

Øda

FaceWidth

F

BoreDiaØB


505556586062646566687072

37.541.2542.043.545.046.548.048.7549.551.052.554.0

39.042.7543.545.046.548.049.550.2551.052.554.055.5

3 15






0.75 Module

481



Prec

isio

nG

ears




NumberNumber

ofTeeth

PCD

Ød

OD

Øda

FaceWidth

F

BoreDiaØB

S75B75A0315S75B80A0315S75B85A0315S75B90A0315S75B95A0315S75B100A0315S75B105A0315S75B110A0315S75B115A0315S75B120A0315

7580859095

100105110115120

56.2560.063.7567.571.2575.078.7582.586.2590.0

57.7561.565.2569.072.7576.580.2584.087.7591.5

3 15





Wor

ms

and

Whe

els,

B

evel

s an

d In

tern

al G

ears

5

Section Contents

Product Range Overview........................................................Page 52

Precision Worms and Wheels ..................................................Page 53

Worms and Wheels....................................................................Page 56

Precision Bevel Gears ..............................................................Page 58

Mitre Bevel Gears ......................................................................Page 511

Bevel Gears ................................................................................Page 513

Brass Bevel Gears ....................................................................Page 514

Brass Internal Gears ................................................................Page 515

Technical Information................................................................Page T41

ProductOverview

52

Worms, Bevels and Internal Gears


Worm

s andW

heels

Worms, bevels and internal gears

Reliance offers a range of worms and wheels, bevel and internal gears that are designed to complementour spur gear range by offering additional motion options. As with the spur gears these gears areoffered as precision grade in stainless steel and brass as a more economical alternative for lessdemanding applications.

Worms and wheelsWorm and wheel drives provide high ratio right angled motion in asmall space. Both precision cut and precision cold rolled worms areavailable (refer to the features, options and technical information on theindividual product pages). In general, for more accurate applicationsthe precision cut worms will give the best results and for applicationsrequiring a little more torque transmission precision rolled wormsshould be used.

Please note that this catalogue only shows a limited range of wormsand wheels. Reliance has the ability to cut worms and wheels from 0.2module up to 1 module; please contact us for requirements for specialvariants.

Bevel gearsBevel gears are more efficient than worms and wheels for right angledrives, but they are typically used for lower ratio applications; if highratios are required a spur gear reduction stage can be incorporated.Typically shaft angles of 90 degrees are used but other angles arepossible – please contact us to discuss your application.

As with the worms and wheels, bevel gears are available in stainlesssteel and brass; the stainless steel option being higher precision thanthe brass option. It is important to note that with the bevel gears, wheretwo gears are shown on the page the part number refers to the gearpair. Where only one gear is shown on the page the part numberapplies to individual gears only – for a pair, two gears must be ordered.

Internal gearsA small range of brass internal gears is offered for use with the brassgear range.

0.5 Module

53

Worms and Wheels


Wor

ms

and

Whe

els

Part number selection tables

PartNumber

Numberof

Starts

ThreadDirection

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

LeadAngle

SetScrew

S MW50SUR1+B 1 Right 9 10 3 7.6 13 18 3º11’ M2.5 2.5

PartNumber

Numberof

Teeth

ThroatDia

Ødt

PCD

Ød

AddModCoef

x

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MG50B20+R1G50B30+R1G50B40+R1G50B50+R1

20304050

11162126

10152025

0.0150.0230.0310.038

11.316.321.326.3

3455

9121516

5

11111313

M3M3M4M4

3344

Worm

Wormwheel

Dimension x: Negative modification to allow for use of standard centres

Set screw supplied

Set screw supplied



Features Technical support• Worm material: Stainless steel SUS304,

precision cold rolled• Wormwheel material: Brass CuZn39Pb3• Single start worm, right hand thread

• Worm gear formulae see page T419• Backlash at nominal centres see page T417• For modified or fully bespoke worms and

wheels, please contact us• Product overview see page 52

0.8 Module

54

Worms and Wheels


Worm

s andW

heels





(Worm shaft)

PartNumber

Numberof

Starts

ThreadDirection

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

LeadAngle

SetScrew

S MW80SUR1+BW80SUR1L 1 Right 10.4 12 5

10.3

8.0(h9)1420

2680 4º24’ M3

3

PartNumber

Numberof

Teeth

ThroatDia

Ødt

PCD

Ød

AddModCoef

x

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MG80A20+R1G80A30+R1G80A40+R1G80A50+R1

20304050

17.625.633.641.6

16243240

0.0290.0440.0590.074

18.126.134.142.1

5566

12161820

6

12121414

M3M3M4M4

3344

Worm

Wormwheel


Set screw supplied

Set screw not supplied

the dash (L) in part number denotes worm shaft type

Type L

Type B

Features Technical support• Worm material: Stainless steel SUS304,

precision cold rolled• Wormwheel material: Aluminium bronze casting

JIS CAC702• Single start worm, right hand thread• Wormwheel suited to right hand, single thread

worm



1.0 Module

55

Worms and Wheels


Wor

ms

and

Whe

els


PartNumber

Numberof

Starts

ThreadDirection

PCD

Ød

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

LeadAngle

SetScrew

S MW1SUR1+BW1SUR2+B

12 Right 16 18 6 15.85 15.5

15.0 32 3º35’7º11’ M4 3.5

PartNumber

Numberof

Teeth

ThroatDia

Ødt

PCD

Ød

AddModCoef

x

OD

Øda

BoreDia(H8)ØB

HubDia

ØA

FaceWidth

F

OverallLength

L

SetScrew

S MG1A20R1+6G1A30R1+6G1A40R1+8G1A50R1+8G1A20R2+6G1A30R2+6G1A40R2+8G1A50R2+8

2030405020304050

2232425222324252

2030405020304050

0.0190.0290.0390.0480.0790.1180.1580.197

23.533.543.553.523.533.543.553.5

66886688

1722253017222530

10 18 M5 4

Worm

Wormwheel


Set screw supplied


Features and options Technical support• Worm material: Stainless steel SUS304,

precision cold rolled• Wormwheel material: Aluminium bronze

casting JIS CAC702• Single (R1) and double (R2) start worm,

right hand thread• Left hand thread direction available,

replace R with L in the part number





0.4 Module

56

Precision Worms and Wheels


Worm

s andW

heels




WormLead Angle 1º 44’

Lead 1.257P.A. 14.5ºPart

Number WGS5S

Wormwheel DimensionsPart

NumberNumber

ofTeeth

PitchDiameter

Single StartWGB83S40WGB83S50WGB83S60WGB83S70WGB83S80WGB83S90WGB83S100WGB83S110WGB83S120

405060708090100110120

16.0020.0024.0028.0032.0036.0040.0044.0048.00


Features and options Technical support• Gear quality AQ10 see page T41• Worm material: Stainless steel (DIN 1.4305)• Wormwheel material: Naval brass QQB637• Antibacklash wormwheels available• Alternative number of starts available

• Worm gear formulae see page T419• For modified or fully bespoke worms and


0.5 Module

57

Precision Worms and Wheels


Wor

ms

and

Whe

els



Part number selection tablesWorm

Lead Angle 3º 10’Lead 1.571P.A. 14.5ºPart

Number WFS5S

Wormwheel DimensionsPart

NumberNumber

of Teeth

PitchDiameter

Single StartWFB83S30WFB83S40WFB83S50WFB83S60WFB83S70WFB83S80WFB83S90WFB83S100WFB83S120

30405060708090100120

15.0020.0025.0030.0035.0040.0045.0050.0060.00

Features and options Technical support• Gear quality AQ10 see page T41• Worm material: Stainless steel (DIN 1.4305)• Wormwheel material: Naval brass QQB637• Antibacklash wormwheels available• Alternative number of starts available

• Worm gear formulae see page T419• For modified or fully bespoke worms and


0.4 Module4 mm Bore

58

Precision Bevel Gears


Worm

s andW

heels



All dimensions in mmGeneral tolerances ±0.13 mmPressure angle 20°Material: Stainless steel 303

PartNumber

(pair)

Overall Length±0.15

Outside Dia+0.00 / 0.05

PitchDia

Hub Length±0.25

Distance to Apex+0.00 / 0.03

PinionL1

GearL2

PinionØD1

GearØD2

GearØE2

PinionC1

GearC2

PinionA1

M04N1SM04N2SM04N3SM04N4S

10.289.869.008.03

10.289.509.138.91

12.5612.9613.0713.11

12.5624.2336.1548.11

12.024.036.048.0

6.006.005.334.50

6.005.005.005.00

14.0019.0024.0029.00

PartNumber

(pair)

Ratio Module Number of Teeth Max. TTCE

(pair)

Max. TCE

(pair)Pinion Gear


1:12:13:14:1

0.4

30303030

306090120

0.025 0.050


Dimension table

Gears supplied as a pair

Features Technical support• Gleason system• Precision bevel gears supplied as a pair


• Product overview see page 52

0.5 Module6 mm Bore

59



Wor

ms

and

Whe

els


Pressure angle 20°Material: Stainless steel 303


PartNumber

(pair)



PitchDia

Hub Length±0.25


PinionL1

GearL2

PinionØD1

GearØD2

GearØE2

PinionC1

GearC2

PinionA1


12.5211.809.9810.03

12.5211.4910.9810.70

16.7117.2017.3417.39

16.7132.2948.1964.14

16.032.048.064.0

7.507.005.305.50

7.506.006.006.00

17.5024.0030.0038.00

PartNumber

(pair)


(pair)

Max. TCE

(pair)Pinion Gear


1:12:13:14:1

0.5

32323232

326496

128

0.025 0.050


Dimension table





0.8 Module8 mm Bore

510



Worm

s andW

heels



All dimensions in mmGeneral tolerances ±0.13 mmPressure angle 20°Material: Stainless steel 303

PartNumber

(pair)



PitchDia

Hub Lengths±0.25


PinionL1

GearL2

PinionØD1

GearØD2

GearØE2

PinionC1

GearC2

PinionA1

M08N1SM08N2S

14.5115.70

14.5113.00

21.1321.93

21.1340.47

20.040.0

8.309.00

8.307.50

20.0030.00

PartNumber

(pair)


(pair)

Max. TCE

(pair)Pinion Gear

M08N1SM08N2S

1:12:1 0.8 25

252550 0.025 0.050


Dimension table





0.8, 1.0 & 1.5Module

511

Mitre Bevel GearsIntegral Clamp


Wor

ms

and

Whe

els


Material: Stainless steel SUS304


PartNumber

OverallLength

L

Outside Dia

ØD

PitchDia

Ød

Bore Dia(H8)ØB

Hub Dia

ØA

HubLength

C

TipDistance

La ØdsML80SU201605ML1SU202106ML1SU302808ML1.5SU203010

10.9514.4817.8420.38

17.1321.4131.4132.12

16203030

568

10

14.516.024.024.0

7.259.00

11.0012.00

8.5711.7113.7116.06

9.511.819.417.7

PartNumber

Ratio

u

Module Numberof Teeth

FaceWidth

F

SetScrew

S M

FaceAngle

Distanceto Apex

ApML80SU201605ML1SU202106ML1SU302808ML1.5SU203010

1:1

0.81.01.01.5

20203020

3.74.36.26.8

M2.5M3M4M4

3455

49º3’49º3’47º42’49º3’

16.0021.0028.0030.00


Dimension table

Clamp Detail

Supplied with two clamp screws

u=1

Gears supplied separately

Features and options Technical support• Gear quality: ISO 8• Recommended shaft tolerance h7 or better• Recommended shaft surface finish

1.6Ra or better• Small quantities of selected items available

exstock, please visit our online storewww.reliance.co.uk/shop

• Mitre bevel gears are not supplied as a pair and need to be ordered separately

• For allowable backlash see page T417• Product overview see page 52

0.8 & 1.0Module

512

Mitre Bevel Gears


Worm

s andW

heels



All dimensions in mmPressure angle 20°Material: Stainless steel SUS304


Dimension tablePart

NumberOverallLength

L

Outside Dia

Øda

PitchDia

Ød

Bore Dia(H8)ØB

Hub Dia

ØA

HubLength

C

TipDistance

LaM80SU20*1605M80SU25*1805M80SU30*2006M1SU20*2106M1SU25*2306M1SU30*2608

11.0011.6712.3414.5314.7015.89

17.1321.1325.1321.4126.4131.41

16.020.024.020.025.030.0

556668

12.016.018.016.020.022.0

6.006.006.009.008.008.90

8.578.578.57

11.7111.2111.71

PartNumber

Ratio

u

Module Numberof

Teeth

FaceWidth

F

SetScrew

S M

FaceAngle

Distanceto Apex

ApM80SU20*1605M80SU25*1805M80SU30*2006M1SU20*2106M1SU25*2306M1SU30*2608

1:1

0.80.80.81.01.01.0

202530202530

3.74.75.64.35.36.2

M3M3M4M4M4M5

3.03.03.54.54.04.5

49º3’48º51’47º42’49º3’

48º51’47º42’

16.0018.0020.0021.0023.0026.00


u=1


Features Technical support• Gear quality: ISO 8• Small quantities of selected items available


• Mitre bevel gears are not supplied as a pair andneed to be ordered separately


* in part number denotes two threaded holes

0.8 & 1.0Module

513

Bevel Gears


Wor

ms

and

Whe

els


Material: Stainless steel SUS304



Dimension tablePart

NumberOverallLength

L

Outside Dia

Øda

PitchDia

Ød

Bore Dia(H8)ØB

Hub Dia

ØA

HubLength

C

TipDistance

LaB80SU20*5B80SU40*6B1SU20*6B1SU40*8

10.7911.0115.0315.02

17.4332.7221.7940.89

16.032.020.040.0

5668

12.020.016.025.0

5.56.08.68.0

6.869.18

10.0512.69

PartNumber

Ratio

u

Module Numberof

Teeth

FaceWidth

F

SetScrew

FaceAngle

Distanceto Apex

ApS MB80SU20*5B80SU40*6B1SU20*6B1SU40*8

2:1

0.80.81.01.0

20402040

4.54.55.75.7

M3M4M4M5

2.53.54.04.0

29º8’66º0’29º8’66º0’

22.5016.4629.6021.80

Set screws not supplied

u=2




• Mitre bevel gears are not supplied as a pair andneed to be ordered separately



0.5, 0.8 & 1.0Module

514

Brass Bevel Gears


Worm

s andW

heels

Associated ProductsShafts: page 112

Bearings: page 121

All dimensions in mmPressure angle 20°Material: Brass ISO CuZn39Pb3


Dimension tablePart

NumberOverallLength

L

Outside Dia

Øda

PitchDia

Ød

Bore Dia(H8)ØB

Hub Dia

ØA

HubLength

C

TipDistance

La

HoleDetail

S MM50B201103B50B20B50B40M80B201605B80B20B80B40M1B20*2106

8.008.547.31

11.0010.7911.0114.53

10.7110.8920.4517.1317.4332.7221.41

10.010.020.016.016.032.020.0

3345566

88

1212122016

5.05.04.06.05.56.09.0

6.355.746.018.576.869.18

11.71

M4

4.5

PartNumber

Ratio

u

Module Number ofTeeth

FaceWidth

F

FaceAngle

Distanceto Apex

ApM50B201103B50B20B50B40M80B201605B80B20B80B40M1B20*2106

1:12:12:11:12:12:11:1

0.50.50.50.80.80.81.0

20204020204020

2.53.23.23.74.54.54.3

49º3’29º8’66º0’49º3’29º8’66º0’49º3’

11.0015.5210.5616.0022.5016.4621.00

u=2

u=1



• Bevel gears are not supplied as a pair andneed to be ordered separately



Set screw suppliedGears supplied separately

0.5 Module

515

Brass Internal Gears


Wor

ms

and

Whe

els


Material: Brass ISO CuZn38Pb2,CuZn39Pb3

Associated ProductsSpur gears: from page 436

PartNumber

Module Numberof

Teeth

PCD

Ød

GearO/DØda

RootDiaØdr

FaceWidth

F

RingO/DØD

IS50B60A0350IS50B80A0360IS50B90A0370IS50B100A0375IS50B120A0380

0.5

608090

100120

30.040.045.050.060.0

29.039.044.049.059.0

31.2541.2546.2551.2561.25

3

5060707580


Features and options• 0.8 module and 1.0 module available• Designed to fit housings with bore tolerance H8• 1.0 module also available in carbon steel ISO

C45, please contact us• Small quantities of selected items available


TechnicalInformation

T41

Standard Gears


Tech

nica

lIn

form

atio

n

GEAR MANUFACTURE

Reliance’s precision instrumentation gears are manufactured using high accuracy gearcuttingequipment. Standard gears are produced in stainless steel, hardened stainless steel, aluminium alloyand brass (wormwheels only). Alternative materials such as PEEK polymer or Delrin are available onrequest.

GEAR TOLERANCES

Gears are generally offered as Quality 10 (see the individual product pages). Higher qualities areavailable as shown in the table below. Most gears in the catalogue can be produced in these qualitiesto order.Reliance standard tolerances are largely based on AGMA 39003 backlash.

Values in the above table refer to measurements obtained by means of the dual flank tester.

To specify a gear, other than the standard quality, add the quality code to the gear part number.Example of a quality 12 gear P05S1B10F6A100 B

Quality code

Reliance Standard Gear Qualities Table values in 0.001mm (0.0001")

QualityClass

ModularRange

TotalComposite

Error

Tooth to ToothComposite

Error

Indicator LimitsGauge zeroed at std. pitch rad.

GearQualityCodeMax Min

AQ9 1.5mod 26 (10) 18 (7) 18 (7) 69 (27) AQ10AQ11AQ12AQ14

0.8 to 0.5 mod

26 (10)18 (7)13 (5)

7 (2.7)

13 (5)10 (4)

8 (3)3.6 (1.4)

18 (7)

61 (24)53 (21)48 (19)41 (16)

CBA

AQ10AQ11AQ12AQ14

0.4 to 0.2 mod

26 (10)18 (7)13 (5)

7 (2.7)

13 (5)10 (4)

8 (3)3.6 (1.4)

13 (5)

51 (20)43 (17)38 (15)33 (13)

CBA

Comparison of National Gear Quality StandardsRelianceQualityClass

AmericanAGMA 390.03

(1980)

BritishBS. 4582

(pt.1 : 1970)

GermanDIN. 867& 3963

InternationalISO

JapanJIS

AdmiraltyBR.6001

AQ9AQ10AQ11AQ12AQ14

Q 9Q 10Q 11Q 12Q 14

Class CClass BClass AClass A

†

Q 8Q 7Q 6Q 5Q 3

87653

43210

Class 3Class 2Class 1

††

† Reliance quality higher than any equivalent in this specification.Table applies to gears up to 50 mm diameter.

TechnicalInformation Standard Gears

T42 Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

TechnicalInform

ation

RELIANCE GEAR STANDARDS FOR FINE PITCH GEARS

The table below is a comparison between Reliance (AGMA) and equivalent UK specifications:

*AGMA values quoted are for over 20T up to 50 mm (2") diameter. Admiralty and B.S. tooth to tootherrors are for over 30T.† Minimum indicator level 0.006" or 0.15 mm.

For numbers of teeth outside the range consult the relevant specification.


T43

Standard Gears


Tech

nica

lIn

form

atio

n

STANDARD MODULES AND CIRCULAR PITCHES METRIC

Reliance’s precision instrumentation spur gears are available as standard in the following modulesand circular pitches, being those most commonly used in the design and manufacture of gear controlmechanisms and instruments:

Module 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0, 1.25, 1.5Circular pitch 1, 2, 2.5, 3

Pressure Angle and Rack FormExcept where stated otherwise, gears in this catalogue are cut to 20º pressure angle involute formteeth. Reliance standard gears will mesh satisfactorily with gears of the same module cut to thefollowing standards:

(i) BS 4582 (1970) Part 1, Figure 1.

(ii) DIN 867 and 58412.

(iii) AGMA 207.06 (Assuming the pitch is cut to an equivalent module).

The gears will not mesh satisfactorily with gears cut to DIN 58400 unless the outside diameter of thelatter is reduced to PCD + (2 x module).

DIN 58400 tooth proportions are:

Addendum 1.1 x ModuleDedendum 1.5 x Module for pitch 0.1 to 0.6 Module

The above list is by no means exhaustive. Please enquire if you require a special module as Relianceholds a large stock of nonstandard cutters.

Metric Tooth Proportions (Dimensions in mm)

Module CircularPitch

Addendum Dedendum WorkingDepth

WholeDepth

Equivalent InchDiametral Pitch

1.51.251.00.80.60.50.40.3

0.250.2

0.3180.6370.7960.955

4.7123.9273.1422.5131.8851.5711.2570.9420.7850.628

1.02.02.53.0

1.51.251.00.80.60.50.40.3

0.250.2

0.3180.6370.7960.955

1.8751.5631.4001.1200.8400.7000.5600.4200.3500.2800.4460.8911.1141.337

3.02.52.01.61.21.00.80.60.50.4

0.6371.2731.5921.910

3.3752.8125

2.41.921.441.20.960.720.60.48

0.7641.5281.9102.292

16.93320.32025.40031.75042.33350.80063.50084.667101.600127.00079.79639.89831.91926.599



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MATERIALS AND SPECIFICATIONS

Reliance’s precision instrumentation gears are manufactured from the materials listed below. Wereserve the right to change the actual material to an equivalent specification without notice dependingon availability.

FinishesStainless steel, bronze and brass gears remain in their natural condition. Passivation to DEF STAN032, process M can be carried out if required. Aluminium components are anodised to specificationDEF STAN 0324 (chromic acid process) or DEF STAN 0325 (sulphuric acid process). Gear teeth arenot normally anodised.

Antibacklash GearsMaterials and finishes of standard antibacklash gear components.

Where possible circlips, antibacklash springs, shims and set screws will be stainless steel. However,some smaller pinions may have beryllium copper or zinc plated carbon steel circlips as standard.

Reliance Precision Gear MaterialsMaterial Specification Used on Material

Code

Stainlesssteel

303S31 (303S21) or303S42 (303S42) or302S31 (302S25) or

BS 970Pin hub gears

Clamp hub gearsHubless gears

WormsGear clamp & hubs

S1

303 to MIL QQS764Stainless

steel 316S31 (316S16) BS 970 Rack pinions S2

Stainlesssteel

(hardened)

174PH1025 Hardened to3442 HRc

Hardened pin hub gears S8

Aluminiumalloy

L168 orHE 15TF or

BS 1474Pin hub gears

Clamp hub gearsHubless gears

Gear clamp & hubs

A1

2024T4 to MIL QQA225/6Phosphor

bronze PB 102 BS 2874 Worm wheels B1

Brass CZ121 BS 2874 Spur gears B2

Brass(Naval) Alloy 464 to MIL QQB637 Worm wheels B3

Acetal Delrin 150 Hubless gears D1


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SPUR GEAR GEOMETRY

A basic description of gear tooth terms is shown below. General formulae to enable correctunderstanding of spur gear geometry is shown opposite.

PINION

GEAR



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TERMINOLOGY FOR METRIC SPUR GEARS

TERM DEFINITION FORMULAE

Addendum The radial distance between the A=M(A) pitch circle and the outside diameter.

Addendum A method of modifying low tooth See page T48modification number gears to avoid undercutting(K) and altering gear size to allow use

of non standard centres.

Backlash The circumferential clearance See page T415(B) between mating gear teeth.

Base circle The diameter of the base cylinder BCD = N·Mcos PAdiameter from which the involute is(BCD) generated.

Base pitch The pitch along the base circle or BP = π Mcos PA(BP) line of action.

Basic rack The straight sided rack shape from See BS 4582.which teeth are generated.

Centre distance Distance between the axes CD = PCDpinion+PCDgear

(CD) of rotation of mating spur gears. 2 2

Circular pitch The distance along the pitch circle CP = π M(CP) between corresponding points on

adjacent teeth.

Circular tooth The distance between opposite faces CTT =πMthickness on the same tooth measured at the 2(CTT) pitch circle diameter.

Clearance The amount by which the dedendum CO = D Aoperating in a given gear exceeds the(CO) addendum of the mating gear.

Dedendum The radial distance between the D = 1.4M (BS4582)(D) pitch circle and the root diameter. = 1.25M (BS436)

Diametral pitch The size of the tooth expressed in(DP) teeth per inch of pitch diameter.

Face width The width of the tooth in an axial plane.

Fillet radius The radius of the fillet curve at thebase of the gear tooth.

Length of action The distance on an involute line ofaction through which the point ofcontact moves during the actionof the tooth profiles.


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Indicator limits The size band of manufacture for thegear measured radially from the PCD.

Module The size of the tooth expressed in(M) mm of pitch diameter.

Number of teeth Number of teeth on the gear.(N)

Outside diameter The diameter over the tops of the OD = PCD + (2M)(OD) teeth.

Pitch circle An imaginary circle whose diameter is PCD = (N+2K)·Mdiameter formed by meshing gears so that the Note: for unmodified gears(PCD) circles actually touch each other, as if K=0

gears were driven purely by the frictionof the circles.

Pressure angle The angle between a line tangential to Standard = 20º(PA) the pitch circles and a line perpendicular

to the tooth profiles at the point of contact.(Equal to the side angle of the basic rackfor standard gears).

Root diameter The diameter of the base of the teeth. RD = OD (2H)(RD)

Total composite The total error in the gear measured by theerror dual flank gear test. TTCE and pitch line(TCE) runout are included.

Tooth to tooth The change in error of each tooth oncomposite error the gear measured by the dual flank(TTCE) tester.

Undercut The loss of profile in the vicinity of the Nmin = 2 involute start at the base circle due to Sin2 PAtool cutter action generating gears withlow tooth numbers.(Nmin = minimum teeth for no undercut)

Whole depth The total depth of a tooth space. H = A + D(H)

Working depth The depth of engagement between WD = 2A(WD) mating gear teeth.

Note: for imperial gears to BS 978 Part 1, Equivalent Module = 25.4DP



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GEARS WITH SMALL NUMBER OF TEETH

Unless otherwise requested, all gears in this catalogue having 16 teeth or fewer will be enlarged byapplying addendum modification in accordance with BS4582 Part 1 (metric) as shown in the tablebelow. These gears are indicated (†) against the appropriate tooth numbers on the product pages.

A small amount of backlash will be introduced between corrected pinions and mating gears when themodification sum is other than zero and the nominal centre distance is adjusted only by an amountequal to the modification sum.

For minimum backlash it will be necessary to either reduce the centre distance further, or to apply asecondary correction to the pinion or wheel. See the above B.S specification for details.

Example (Module)Find P.C.D. and O.D. of enlarged gear having 13 teeth, 0.6 module

P.C.D. =13.4794 (from table) x 0.6 module =8.088 mm(Standard P.C.D. would be 13 x 0.6 =7.800 mm)

Similarly,O.D. =15.4794 (from table) x 0.6 module = 9.288 mm(Standard O.D. would be 7.8 + (2 x 0.6) = 9.00 mm)

Note:For Imperial (diametral pitch) gears, divide the PCD or OD value in the table by the diametral pitch.The answer will be in inches.

X = Uncorrected PCDY = Corrected PCD

Data for Addendum Modified Gears of Unit Module and Unit DPNo. of Teeth Addendum

ModificationEnlarged

PCDEnlarged OD

(PCD+2)10111213141516

0.41510.35660.29820.23970.18120.12270.0642

10.830211.713212.596413.479414.362415.245416.1284

12.830213.713214.596415.479416.362417.245418.1284


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ENGINEERING DATA

For instrumentation Reliance normally recommend stainless steel pinions mating with aluminium alloygears. Generally the pinion is subjected to most wear since it experiences a higher number of stresscycles than the wheel. This combination of materials tends to balance the wear between the pinionand the gear.

1. Gear MaterialsStainless steelThe 300 series stainless steels are used for gears when maximum corrosion resistance is required.They are ‘true’ stainless steels containing 18% chromium and 8% nickel.

Gears made from 303 stainless steel are essentially nonmagnetic and cannot be hardened by heattreatment. They are recommended for low torque applications as their mechanical properties andresistance are low.

Hardened stainless steel174PH is a precipitation hardening stainless steel that offers a remarkable combination of highstrength and hardness. Its high chromium content (1517.5%) makes it an excellent material forarduous environments.

Aluminium alloyGears made from aluminium alloy are widely used in measuring applications. Its light weight offersreduced inertia. The inertia of an aluminium alloy gear is approximately 35% that of a steel gear. Inparticular, aluminium alloy L168 offers excellent corrosion resistance when anodised, moderatelygood mechanical properties and good stability.

Phosphor bronzeAs a gear material phosphor bronze has a fine grain and good resistance to tooth sliding wear henceits use as a worm wheel material.

2. InstallationGears in this catalogue are designed to be a slide fit on the shafts. The gears are available with fourfixing methods: standard clamp, pins, set screws and ReliaGrip™ clamp.

Traditional clamp hub style gears have a gear hub with a relatively thin wall partially split. The clampis a close fit on the hub and is compressed when the clamp screw is tightened. Clamping gears ontothe shaft offers extremely easy assembly with the best assembled accuracy. However, as thefastening depends upon friction it can only be used in low torque applications.

Pin type gears are supplied as standard with a set screw and a subdrilled hole. The set screw shouldbe used to position the gear on the shaft during the drilling and pinning operation and can beremoved once the gear is secure.

The subdrilled hole provides a lead in for the drilling operation. It is recommended that drilling andpinning is completed outside the gearbox and the gear is thoroughly cleaned afterwards.

In less critical applications the set screw may be used to retain the gear on the shaft. To avoiddamaging the shaft and to make removal of the gear easier the set screw should seat on a small flat,or dimple on the shaft.



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3. LubricationAll gears should be lubricated, but there are variations in degree.

Highly loaded precision gears should be in enclosed assemblies with complete lubrication to obtainthe best possible hydrodynamic film. The system can be splash, spray or force fed, depending on theapplication. Moderately loaded precision gears, such as fractional horsepower systems, should beenclosed with oil or grease lubrication which can be spread by splash or dip lubrication.

Lightly loaded gears in instrumentation systems only need to have a marginal boundary lubrication asprovided by periodically wiped on oils or grease. In many instances a light coat of Rocol MT LM orsimilar molybdenum disulphide grease will suffice for the life of the system. Antibacklash gearsshould not be directly lubricated except via a very light application on the mating pinion.

Negligibly loaded fine instrument gears only need a brushed on film of light oil as a simple means ofreducing friction.

4. SpeedThe maximum pitch line velocity for stainless steel meshing with aluminium alloy with boundarylubrication is approximately 5,300 mm/sec (for a pair of meshing actuation gears correctly lubricated,this rises to approximately 8,000 mm/sec). This represents 5,000 rpm on measurement gears of 20 mm diameter (and 7,500 rpm on actuation gears of 20 mm diameter).

For speeds in excess of this and other material combinations please consult Reliance technical sales.

5. Gear LoadingThe gears in this catalogue can be used for both feedback and actuation systems. The loads andmaterial selection will depend on the application. In general a feedback system is designed tomaintain accuracy and an actuation system is designed to transmit power.

5.1. Actuation GearsThe following analysis is intended to give a guide to the load capacity of a pair of spur gears. Tosimplify the calculations, a number of assumptions have been made. It must be noted that in manyapplications this will give a conservative estimate of the gear capacity, therefore, in criticalapplications an exact analysis must be completed.Please consult the relevant gear standards or Reliance Technical Sales.

The analysis is based on AGMA 2001B88 and assumes the following:

1. The gears are simply supported in rolling element bearings.2. Pinion revolutions >107.3. Gears are grease lubricated.4. Reliability of 1 failure in 100 is acceptable.5. Gear material is 174PH hardened.


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The basic load capacity (Fb) of a pair of spur gears is defined as the maximum tangential force atwhich they can operate indefinitely.

Fb has two values: one calculated from tooth root strength (Fbs), and one for tooth flank pitting (Fbw).The useful or transmitted load capacity, Ft, is usually less than Fb due to transient or dynamic loadsgenerated within the mechanism.

For tooth root strength Fts = Fbs/Ka Ka & Ca = Application factorsFor tooth flank pitting (wear) Ftw = Fbw/Ca

Both calculations should be made and the lower value used.

The application factors Ka and Ca make allowance for any externally applied loads in excess of thenominal tangential force Fb and they are most accurately determined by direct measurement. Indetermining application factors, consideration should be given to the fact that many prime moversdevelop momentary peak torques appreciably greater than those determined by the nominal ratings ofeither the prime mover or the driven equipment. There are many possible sources of overload whichshould be considered including system vibrations, acceleration torques, overspeeds, variations insystem operation and changes in process load. Impact loads due to reversing across backlash can besignificant in servo systems.

As a general guide application factors for a motor gear system range from 1.0 for uniform loads up to1.75 where heavy shock loads are anticipated.

Fb = Basic load capacity (Fbs & Fbw)For strength Fbs = 177.7 x J x F x M x Kv [N] N = Number of teeth

J = Geometry factor, strengthI = Geometry factor, wear

For wear Fbw = 14.64 x N x I x F x M x Kv [N] F = Face width of smallest gearM = ModuleKv = Dynamic factor

(i) Number of teethThis is the number of teeth in the gear being analysed.

(ii) Geometry factors, I and JThese factors take account of the effect of tooth proportions on stress. The bending strengthgeometry factor, (J) takes account of the shape of the tooth. The wear resistance geometry factor, (I)takes account of the radii of curvature of the contacting tooth profiles. Please see the graphs on pageT413.

(iii) Face width, FThis is the face width of the smallest gear in mm. (Face width in contact).

(iv) Module, MThis is the gear module expressed as shown on the respective gear pages.

(v) Dynamic factor, KvThis accounts for internally generated gear tooth loads which are induced by the nonconjugatemeshing action of the gear teeth.



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Example calculation to find the theoretical load capacity of a 5:1 pass of 174PH spur gears asfollows:

Pinion P06S8B6F4A25Gear P06S8B8F6A125

Pinion speed is 500 rpm.

(i) Number of teeth from part number = 25

(ii) Geometry factors from graph

J = 0.37I = 0.118

(iii) Smallest gear face width from part number

F = 4

(iv) Gear module from part number

M = 0.6

(v) Dynamic factor from equation

For quality 10 gears onlyVt = Pitch line velocity (m/s)

Fbs = 177.7 x 0.37 x 4 x 0.6 x 0.96 = 151.5 N

Fbw = 14.64 x 25 x 0.118 x 4 x 0.6 x 0.96 = 99.5 N

For alternative materials the above values need to be modified as shown below:

Gear Material Modification FactorsMaterial Specification Strength Wear

Hardened stainless steelStainless steelStainless steel

Aluminium alloyBrass

174PH303S31316S31

L168CZ121

1.000.430.470.370.35

1.000.150.200.100.13


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Example:If the gears in the example on the previous page were made from 303S31

Fbs = 151.5 x 0.43 = 65.1 NFbw = 99.5 x 0.15 = 14.9 N

The application factors should be applied after the reduction for material.

Geometry factor, Strength (J), 20º spur

Number of teeth in gear for which geometry factor is desired

0.55

0.50

0.45

0.40

0.35

0.30

0.25

0.20

12 15 17 20 24 30 35 40 45 50 60 80 125 275 1000

Geo

met

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ctor

(J

)

10001708550352517

Number of teeth inmating gear

Geometry factor, Wear (I), 20º spur

Geo

met

ry fa

ctor

(I)

0.160

0.140

0.120

0.100

0.080

0.0601 32 4 5 6 7 8 9 10

Ratio

Np= 50 or more

Np= 30Np= 24

Np= 16

Np= Number ofteeth in the pinion.



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5.2. Instrumentation and Feedback SystemsGears and components designed for the precise transmission of angular position generally work atthe low torque levels normally associated with servo components such as synchros, resolvers, opticalencoders etc. Tooth loads of 1.2 N per mm face width should result in an adequate accurate life.Higher loads will tend to increase deflections of gear teeth, shafts, bearings etc, resulting in significantvalues of lost motion and a decrease in life.

Example: To find the maximum advisable torque on a gear 40 mm diameter x 3 mm face width.

Torque = force x radius = 1.2 x 3 x 0.04/2 = 0.072 Nm (10 oz.in.)

5.3. Antibacklash Gear Spring TensionIn order for antibacklash gears to function as antibacklash devices, it is necessary to ensure that thespring tension will provide sufficient torque to overcome the friction and acceleration torque in thesystem, ie the spring torque must be capable of driving/accelerating the gear train and any associatedcomponents.

The spring tension capability of antibacklash gears listed in this catalogue will adequately cope withthe low torques normally encountered.

As a general guide, torque settings on antibacklash gears of 1.059 to 1.765Ncm (1.5 to 2.5 oz.in.)will suffice in most applications. Ideally the spring torque should be set to the minimum at which theantibacklash gear performs satisfactorily, thus avoiding unnecessary high preload on the gear teethand premature wear.

6. Lost Motion and Backlash ControlThe following section deals with lost motion, which we know to be one of the basic problems indesigning fine pitch gear trains. The accepted definition of lost motion is the amount by which theoutput shaft may be turned without turning the input shaft.

It may be thought that lost motion is a function of the gear cutting operation alone, but, in fact theteeth of the gears may contribute very little to the overall lost motion value. A complete understandingof all the elements which induce lost motion is essential in order to achieve a well designed gear train.The following factors must be individually considered for their own contribution to overall lost motionin the gear train:

(a) Nominal centre distance.

(b) Centre distance tolerance.

(c) Size and tolerance of mating gears.

(d) Total composite error of gears.

(e) Fits between bores, shafts and bearings.

(f) Bearing accuracy (class).

(g) Radial play of bearings.

(h) Shaft straightness and alignment.

(i) Fits between electrical and/or mechanical component spigot diameters, and housing bores.

(j) Eccentricity and radial play of electrical and/or mechanical component shafts.

(k) Torsional elasticity.

(l) Differential expansion.


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Each of the previous, except nominal centre distance, tend to induce a change in centre distancewhich will push together or pull apart the mating gears. This pushpull action produces two backlashvalues, minimum at the point of the tightest mesh, and maximum at the point of loosest mesh.

(a) Calculation of Nominal Centre Distance

Nominal centre distance can be considered as the starting point in the calculation of overall backlashvalues. Nominal centre distance is calculated by taking half the sum of the (theoretical) pitchdiameters of the mating gears.

(b) Centre Distance Tolerance

Centre distance tolerance is an extremely important area for consideration. Any increase in centredistance in excess of the nominal value will increase the backlash. A decrease in nominal centredistance will decrease the backlash. In this case caution must be exercised to avoid interferencebetween mating gears as a result of this decrease.

The relationship between centre distance change to backlash for 20º PA spur gear is given by:

Note: Maximum Angular Backlash = Maximum Circumferential Backlash x 57.3 x 60(minutes of arc) Pitch Circle Radius

7. Gear ErrorThe error function of a gear is approximately sinusoidal and for practical considerations can beassumed to be so. The first derivative of the time displacement curve yields the velocity function,therefore, the output velocity variable will also be an approximate sinusoid but the maximum velocityerror will be displaced 90º from the maximum position error.

In summation, pitch circle runout will cause a sinusoidal error which is revealed as an outputtransmission error when meshed with a mating gear. The magnitude is given by the followingexample:

In the example on page T416, if the small pinion were not a perfect gear its error would be seensuperimposed on the large gear error cycling at pinion frequency.



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8. Transmission Accuracy of Gear TrainsThe following section is based on work carried out by Reliance Gear Company (now known asReliance Precision Limited) to provide some guidance in the design of accurate data transmissiongearing.

The transmission error referred to by equations 1 and 2 below represent the maximum statistical pointto point error during a forward and reverse cycle of a single pass of quality 14 antibacklash gearingassembled in a data transmission gearbox.

For quality 10 or 12 gearing add 50% or 30% respectively to the error calculated for quality 14gearing.

For average transmission error substitute the numbers 3.25 and 83 in the equations for the numbers4.4 and 112 respectively.


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Gear Type Condition Module (m) Backlash (mm)

Spur GearBrass/ Ground < 0.9 0.02 0.06

Brass 0.9 to 0.75 0.04 x m 0.10 x mGround 0.9 to 1.0 0.04 x m 0.08 x m

Bevel Gear pair Stainless steel or Brass < 0.9 0.02 0.080.9 to 1.5 0.05 0.12

Worm Gear pairCentres < 50 mm

Worm Stainless steelWorm wheel Brass ≤ 1.0 0.08 0.20

BACKLASH FOR STANDARD GEARS

The table below refers to the allowable backlash within the range of Spur, Bevel, and Worm gear pairswith a designated centre distance. The allowable backlash is necessary to absorb the deviations ofnoise and oscillation in order to maintain smooth operation.

Note. These figures apply to the standard gear range only.To convert Circumferential Backlash to Angular Backlash see page T415

Module 0.5

TYPICAL GROUND GEARS ALLOWABLE TRANSMISSION CAPACITY



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Module 0.8

Module 1.0


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Ratio (R) No. of teeth on wormwheel (T)No. of starts on worm (t)

CentreDistance (CD)

Lead (L)

PCD worm PCD wheel2 2

The axial distance by whicha thread advances in onerevolution

= πx t x m

=

=

=

Axial module=

=

Where m

m

(metric)

(imperial)1

DP

Actual outside diameter of worm

Typical outside diameter of wormwheel

OD

ODw

ww

= P C D + ( 2 x m )

= P C D + ( 3 x m )

+

WORMS AND WHEELS FORMULAE

RG36 Issue A2

brass, ground and precision spur gears · reliance antibacklash gears have been developed over a...

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