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IS 12339 (1988): Crank Shaft for Jute Looms [TXD 14:Machinery for Fabric Manufacture]

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18 : 1233. - 1U8

Indian Standard

SPECIFICATION FORCRANK SHAFT FOR JUTE LOOMS

...

© Copyright 1988

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Septembt1 1988

IS : 12339 - 1981

Indian Standard

SPECIFICATION FORCRANK SHAFT FOR JUTE LOOMS

O. FORE W 0 R D

0.1 This Indian Standard was adopted by theBureau of Indian Standards on 9 March 1988,after the draft finalized by the Jute MillMachinery/Accessories and Spare Parts SectionalCommittee had been approved by the TextileDivision Council.

0.2 This standard has been formulated with aview to providing guidance to manufacturersand users of crank shaft for jute looms. Thisstandard would ensure manufacture of crankshafts of acceptable quality leading to improvedfunctioning of the jute looms,

1. SCOPE

1.1 This standard prescribes the requirements ofcrank shaft used in jute looms.

2. TERMINOLOGY

2.0 For the purpose of this standard, thefollowing definitions shall apply .

2.1 Left-Hand Loom - A loom with thestarting handle on its left hand side,

2.2 Right-Hand Loom - A loom with thestarting handle on its right hand side.

NOTE - If an observer stands near the deli very end ofthe loom and looks against the run of the warp, the sid eon his left-hand is left-hand side of th e loom and the sid eon his right hand is the right-hand side of the loom.

2.3 Reed Space ( of the Loom) - Maxim urnspace available on loom for the insertion of areed, that is, the overall width of the reed whichcan be fixed on the loom.

0.3 For the purpose of deciding whether aparticular requirement of this standard iscomplied with, the final value, observed orcalculated, expressing the result of a test oranalysis, shall be rounded off in accordance withIS: 2-1960-. The number of significant placesretained in the rounded off value should bethe same as that of the specified value in thisstandard.

-Rules for rounding off numerical values ( revised ),

and journals of the crank shaft shall be smoothfinished and polished. The roughness value (R. )ofcrank pins and the journals shall be within 1'6to 6'3 (.Lm.

3.3 Co-altiality and Parallelism - Whilemanufacturing the crank shaft, the co-axialityof journals and crank pins and parallelism be­tween the axis of the journals and the crankpins should be maintained.

4. REQUIREMENTS

4.1 Dimensions

4.1.1 Nominal - The nominal dimensions ofthe crank shaft shall be as agreed to betweenthe buyer and the manufacturer. In the absenceof any agreement, these shall be as declared bythe manufacturer,

4.1.2 Tolerance - The nominal dimensions ( setFig. I ) shall be subject to the following toleran­ces in millimetres:

Dia Dz - 0'025}- 0'050

E ±0'4F ± 0'25G ±O'25H + 0'13

- 0'00

2.4 Crank Radius - The perpendicular dis­tance between the axis of the crank shaft journaland the axis of its crank pin.

3. MANUFACTURE

3.1 Material - Crank shaft shall be manufac­tured from carbon steel bars conforming toClass 2A of IS : 1875-1978-.

3.2 Workmanship and Finish -The shaftshall be straight and free from rust. Crank pin

-Specification for carbon st eel billets, blooms, slabs andbars for forgings ( f ourth reoisicn ) ,

ABC

Dia o.

±0'4 1± 0'13 I±O'4 ~- 0'025 I- 0'050)

Key way depth

Key way width

± 0'13

+ 0'026+ 0'013

IS : 1233t - 1988

FIG. I CRANK SHAFT FOR JUTE LOOMS

4.2 True RUDIling - The journals and crankpins of the crank shaft shan run true. However,when tested by the method given in A-I, out­of-true running of journals and the crank pins,if present, shall not exceed 0'025 and 0'013 mm,respectively.

4.3 Parallelism - Each of the crank pins shallbe parallel to both the journals. However, whentested by the method given in A-2, a deviationof 0'05 mm from parallelism shall be permitted.

4.4 Crank Radius - The variation in crankradius of the crank shaft when tested by themethod given in A-3, shall not exceed 0'2 mm.

4.5 Dynamic Balancing - The central portionof the crank shaft shall have machined surfacefor achieving dynamic balancing.

5. MARKING

5.1 Each crank shaft shall be marked, at asuitable place, with the following:

a) Reed space of the loom on which it is tobe used, and

b) 'R' or 'L' depending upon the right-handor left-hand loom on which it is to beused.

5.1.1 Each crank shaft rna y also be markedwith the Standard Mark.

NOT. - The use of the Standard Mark is governedby the provisions of the Bureau of Indian Standards

2

Act 1986 and the Rules and R egulations made th ere­under . The Standard Mark on product s covered b y anIndian Sta nda r d co nveys the assu ra nce that they ha vebeen produced to co mply with th e requirements of thatstandard und er a well-defined system of inspection,testing and quality co ntrol which is devised and super­vised by BIS and operat ed b y the producer. Standardmarked pr oducts are also continuou sly checked b y stsforconformity to th at standard as a further safeg uard .Details of condi t ions under which a licence for the meof the Sta ndard M ark may be granted to manufacturersor producers may be obtained from the Bureau ofIndianStandards,

6. PACKING

6.1 The crank shaft shall be coated lightly withrust preventive grease and shall be held in semi­circular slots cut out in fou r parallel woodenplanks fixed in vertical position inside a woodencase. The slots should be suitably protected sothat wood does not come in direct contact withthe shaft. The wooden case shall be strongenough to withstand the hazards of transit.

6.2 Each case shall be marked with the followinginformation:

a) Manufacturer's name, initials and trade­mark, if any;

b) Reed space of the loom on which the crankshafts are to be used;

c) 'R' or 'L' depending upon the right-handor left-hand loom on which the crank shaftis to be used; and

d) Number of crank shafts in the case.

IS : 12339 - 1981

APPENDIX A

( Clauses 4.2, 4.3 and 4.4 )

METHODS OF TEST

A-t. TRUE RUNNING OF JOURNALS ANDCRANK PINS

A-t.t A surfac e plate, two V-blocks and amicrometer dial gauge shall be used for thepurpose of this test.

A-t.2 True Running of Journals - Set th eV -blocks on the surface plate. Take a crankshaft and mount it with its journals in the V­blocks. Set the micrometer dial gauge in such away that its anvil head is held in contact withthe surface of one of the journals of the crankshaft. Adjust the pointer of the dial gauge tozero position. Rotate the shaft once. Observethe maximum deflection of the needle of themicrometer dial gauge on both sides of the zeroposition. Add the two values and divide the sumby two . Repeat the test at 4 more plac es alongthe length of the same journal and at 5 placesalong the length of the second journal.

A-1.3 True Running of Crank Pins - Set theV-blocks on the surface pl ate . T ake a crankshaft and mount it with it s pins in the V- blocks.Set th e micrometer dial gauge in such a wa ythat its anvil head is held in contact withth e surface of one of the crank pins ( SllNote ). Adjust the pointer of the dial gauge tozero position. Rotate th e sha ft once. Observethe maximum deflection of the pointer of themic rometer dial g auge on both sides of the zeroposition. Add the two values and divide the sumby two. Repeat the test at one more place alongthe length of the same pin and at two places onthe second cr ank pin.

NOTE - The p oint of conta ct sho uld b~ sele cted atabout 10 mm from either end of the crank pin.

A-I.4 Report the crank shaft to be in conformitywith the requirements of 4.2 if none of thevalues as obtained in A-t.2 and A-t.3 exceed0 '025 and 0'013 mm, respectively .

A-2. PARALLELISM OF CRANK SHAFTJOURNALS AND CRANK PINS

A-2.1 A surface plate, two V-blocks and a di~lindicator shall be used for the purpose of thistest.

A-2.2 Set the V-block on the surface plate.Take a crank shaft and mount it with its journalsin the V-blocks so that the crank pins are intheir lowest position .

A-2.3 Mark two points A and B , 50. mm apa r ta t the highest surface of one of the Journals ofthe crank shaft. Set the indicator at point A. a nd

3

adjust its pointer at zero posinon. Mo ve theindicator from A to B i see Note ). Record themaximum indicator reading with its properalgebraic sign ( t hat is, plus or minus ) . Mark twopoints C and D , 50 mm apart at th e highestsurface of the crank pin which is nearest to thejournal tested as above. Set the ind icator atpoint C and adjust its pointer at zero posit ion.Move the ind ica tor from C to D. Record themaximum indicator reading with its properalgebraic sign (that is, plus or minus) . Deter­mine the algebraic difference between the twovalues measured on the journal and the crankpin.

~()TB-Thc ind icator may be moved from A ( 0 B bymoving its base al ong the edge of a parallel which hasbeen set parall el to the sides of V -blocks.

A-2.4 Rotate the shaft through 90e( a quarter

rotation) and keep it in this position bysuitable means. Repeat the procedure prescri­bed in A-2.3.

A-2.5 R epeat th e procedure prescr ibed in A-2.3and A-2.4 on the second journal and the secondcrank pin .

A-2.6 Report the crank shaft to be in confor­mity with th e requirements of 4.3 if none of thevalues observed in A-2.3, A-2.4 and A-2 .5 ex­ceeds 0'05 mm.

A-3. CRANK RADIUS

A-3.t Surface plate, two V-blocks and a vernierheight gauge shall be used for the purpose ofthis test .

A-3.2 Set the V-blocks on the surface plate.Take a crank shaft and mount it with its journalsin the V-blocks in such a way that the crankpins are in the lowest position. Measu re theheight of top of the crarik pin in this positionat a point A with the vernier height gauge.

A-3.3 Rotate the crank shaft through 1800 sothat the crank pins are in their highest position.Keep the cra nk pins in this position by suitableme ans (see Note 1). Measure with the vernierheight gauge the height of the top of the crankpin in this position at a point B correspondingto the point A ( Jet Note 2).

,",on: 1- The cr a nk pins can be kep t in thi s p osit ionby hold ing the crank sha ft against an angle pl at e.

,,"OTE 2 - The poin t B co r res po ndi ng to th e p oin t .1mav a utoma ti ca lly be obtained by keeping th e heightga ug e in th e sa me positi on and raising the sc ri b er to therequ ired height .

lSI 12339 - 1_A-3.4 Subtract the height obtained as in A-3.2from the height obtained as in A-3.3. Divide thevalue so obtained by two. (This value shall beequal to the radius of the crank. )

A-3.5 Repeat the test on the second crank

pin.

A-3.6 Report the crank shaft to be in conformitywith the req uirernents of 4.4, if the difference inthe values obtained in A-3.4 and A-3.5 is notmore than 0'2 mm.

/

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