MECHANICAL ASSEMBLY

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Methods to Apply Required Torque forThreaded Fasteners1. Operator feel - not very accurate, but adequate formost assemblies2. Torque wrench –indicates amount of torque duringtightening3. Stall-motor - motorized wrench is set to stall whenrequired torque is reached4. Torque-turn tightening - fastener is initially tightenedto a low torque level and then rotated a specifiedadditional amount©2002 John Wiley & Sons, Inc. M. P. Groover, “Fundamentals of Modern Manufacturing 2/e”
RivetsUnthreaded, headed pin used to join two or more parts bypassing pin through holes in parts and forming asecond head in the pin on the opposite side•Widely used fasteners for achieving a permanentmechanically fastened joint•Clearance hole into which rivet is inserted must beclose to the diameter of the rivet©2002 John Wiley & Sons, Inc. M. P. Groover, “Fundamentals of Modern Manufacturing 2/e”
Page 1 and 2: MECHANICAL ASSEMBLY•Threaded Fast
Page 3 and 4: Products of Mechanical Assembly•M
Page 5 and 6: Reasons Why Mechanical Assembly isO
Page 7 and 8: Screws, Bolts, and NutsScrew - exte
Page 9 and 10: Some Facts About Screws and Bolts
Page 11 and 12: Types of Screws•Greater variety t
Page 13 and 14: Self-Tapping Screws•Designed to f
Page 15 and 16: Figure 33.6 - Screw thread inserts:
Page 17 and 18: Figure 33.8 - Types of washers: (a)
Page 19 and 20: Figure 33.9 - Typical stresses acti
Page 21: Tools and Methods for ThreadedFaste
Page 25 and 26: Rivets -Applications and Advantages
Page 27 and 28: Interference FitsAssembly methods b
Page 29 and 30: Shrink and Expansion FitsAssembly o
Page 31 and 32: Figure 33.13 - Snap fit assembly, s
Page 33 and 34: Figure 33.14 - Retaining ring assem
Page 35 and 36: StaplingPreformed U-shaped staples
Page 37 and 38: Placement of a component into a mol
Page 39 and 40: Integral FastenersComponents are de
Page 41 and 42: SeamingEdges of two separate sheetm
Page 43 and 44: DFA Guidelines•Use modularity in

MECHANICAL ASSEMBLY

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