me_350_-_lect_21_-_ch_33.20091109.4af8e1f3db8e04.24486567

me_350_-_lect_21_-_ch_33.20091109.4af8e1f3db8e04.24486567 -...

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Mechanical Assembly: 1. Threaded Fasteners 2. Rivets and Eyelets 3. Assembly Methods Based on Interference Fits 4. Other Mechanical Fastening Methods 5. Molding Inserts and Integral Fasteners 6. Design for Assembly ME 350 – Lecture 21 – Chapter 33
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Two Types of Mechanical Assembly 1. Methods that allow for disassembly Example: threaded fasteners 2. Methods that create a permanent joint Example: rivets
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Threaded Fasteners What is the difference between a “screw” and a “bolt”? Bolt: threaded shaft that goes into a (non-affixed) nut ? Screw: threaded shaft that goes into a threaded hole ?
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Function: to fasten collars, gears, and pulleys to shafts Setscrews Self-Tapping Screws Function: to form or cut threads into a hole Self tapping bolt?
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Screw Thread Inserts Internally threaded plugs or wire coils designed to be inserted into an unthreaded hole Usually assembled into weaker materials to provide strong threads
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Washer Simplest form = flat thin ring of sheet metal Functions: 1. Distribute stresses / provide support 2. Protect part surfaces and/or seal the joint 3. Resist unfastening/ increase spring tension (a) washer, (b) washer, (c) washer
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Means of bolt failure: 1. 2.
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