mechanical engineering drawing meng 204 summer semester 2015 by: dr. ghassan mousa fasteners &...
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Mechanical Engineering Drawing MENG 204
Summer Semester 2015By:
Dr. Ghassan Mousa
Fasteners & shafts
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Thread standards & definition
• d: major diameter
• p: pitch
• l: lead
• Multiple threads
• Die for external threading.https://www.youtube.com/watch?v=gVcwjjBAT4Q
• Tab for internal threading
Fig. 8.1 Terminology of screw threads
http://www.gizmology.net/nutsbolts.htm
Threaded fastenersUsed to non-permanently join one or more objectstogether.
http://www.walter-tools.com/en-gb/tools/standard_products/threading/overview/hss_tap/eco_ht/Pages/default.aspx
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Types
Three types of threaded fastener. (a) Bolt and nut; (c) Cap screw; (c) stud.
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Metric thread
• Thread angle is 60˚
• M8 × 1.25
Imperial thread
• Thread angle is 60˚
• 3/8 – 24 UNF
Table 8-1 Geometrical data for Standard Bolts (SI)
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Power screw
Trapezoidal thread
• Thread angle is 30˚
• Tr 36 X 10
Buttress Thread
• Thread angle is 30˚
• S 40 X 7
Loading Direction
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Strength
Bolts in axial loading fail at the:
• Fillet under the head.
• Thread runout.
• 1st thread engaged in the nut.
Table 8-11 Material properties of steel bolts
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• Setscrew
• washer
• Nuts• Slotted nut jam nut
• Prevailing torque locknut
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Design (Configuration)
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Design (Head Style)
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Design (Drive Type)
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Thread dimension
Threaded Fasteners Preferred
Sizes (Length):
• 2, 3, 4, 5, 6, 8, 10
• 12, 16, 20, 25, 30
• 35-60, 65, 70, 80
• 90-140, 150, 160, 180, 200
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Shafts
• Used to transmit power (torque).
• The shorter the better.
• Load carrying components should be placed near the bearing.
• Means of transmitting power through:• Gears• Belts• Chains
• Torque is transmitted by using keys
• Axial force is supported by using Pins
Stepped shaft
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Retaining rings
External ringE ring
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Keys
Tapered keyGib head tapered key
Woodruff key
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Pins
Spring pin
Dowel pinHairpin cotter
Cotter pin Tapered pin
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