Machine Tool Operations
Objectives:
6.1. Identify several types of fasteners.
6.2. Explain why inch based fasteners are not interchangeable with metric based fasteners.
6.3. Describe how some fasteners are used.
6.4. Select the proper fastening technique for a specific job.
6.5. Describe chemical fastening techniques.
Procedure:
1) Carefully study the chapter, and then answer the following questions in the space provided.
Questions:
1) For maximum strength, a threaded fastener should screw into its mating part a distance equal to ___________ times the diameter of the thread.
2) There are many ways of joining material. List four types of threaded fasteners.
a) _______________________________________________________________
b) _______________________________________________________________
c) _______________________________________________________________
d) _______________________________________________________________
3) ________ screws are used for general assembly work.
4) How is the strength of a hex-head cap screw indicated? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
5) When removing stubborn sheared bolts, what can be done to make their removal easier? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
6) To prevent a pulley from slipping on a shaft, a ___________________ is often employed.
7) The _____________ bolt is threaded at both ends.
8) ______________ or _________________ are employed when the parts are to be joined permanently.
9) Why are lock washers used? __________________________________________________________________________________________________________________________________________
10) While most __________________ must be seated in grooves, a self-locking type does not require a special recess.
11) When a jam nut is employed? __________________________________________________________________________________________________________________________________________
12) The shape of the _____________ nut permits it to be loosened and tightened without a wrench.
Match each word in the left column with the most correct sentence in the right column. Place the appropriate letter in the blank.
13) _____Rivet
14) _____Jam nut
15) _____Drive Screw
16) _____Thread-cutting screw
17) _____Acorn nut
18) _____Dowel pin
19) _____Blind rivet
20) _____Keyway
21) _____Keyseat
22) _____Key
a) Developed for use in confined area, where a joint is only accessible from one side.
b) Used where parts must be aligned accurately and held in absolute relation with one another.
c) Prevents a pulley or gear from slipping on a shaft.
d) Protects projecting threads.
e) Is hammered into a drilled or punched hole.
f) Used to make permanent assemblies.
g) Slot cut in gear or pulley to receive “c.”
h) Locks a regular nut in place.
i) Eliminates costly tapping operations.
j) Slot cut in shaft to receive “c.”
23) List the steps, in their proper sequence, which must be used to join metals with adhesives. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
24) List at least five safety precautions that must be observed when using fasteners? ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________