TEST YOUR KNOWLEDGE
Please do not write in this text. Write your
answers on a separate sheet of paper.
1. When drilling holes over 1/2″ (12.5 mm) in
diameter on a lathe, you should drill a(n)
_____ hole first.
2. Which method of filing should be used when
filing on a lathe? Why?
3. A lathe mandrel is used _____.
(a) when the outside diameter must be
machined eccentric to a reamed or
bored hole
(b) when the outside diameter must be
machined concentric to a reamed or
bored hole
(c) to eliminate a reaming or boring operation
(d) None of the above.
4. Through the use of a(n) _____, both internal
and external grinding can be performed on
a lathe.
5. _____ lathes are equipped with a six-sided
tool holder to which a number of different
cutting tools are fitted.
Match the following terms with their descriptions.
(a) Reaming
(b) Filing
(c) Boring
(d) Knurling
(e) Polishing
6. Machining process used to form horizontal
or diamond-shaped serrations on the circum-
ference of the work.
7. Operation used to remove burrs and round
off sharp edges.
8. Operation used to make a hole accurate in
diameter and finish.
9. Operation used to produce a fine finish on a
piece of work.
10. Operation used to produce a hole that
is concentric with the outside diameter of
the work.
RESEARCH AND DEVELOPMENT
1. Make an appointment with a skilled
machinist. Ask him for the shortcuts and
unusual techniques he uses when operating
the lathe. Evaluate the techniques for safety,
good work habits, time saved, and adapt-
ability to the school shop.
2. Invite the manager of the state or federal
employment agency in your area to discuss
work opportunities in metalworking in your
community.
3. Demonstrate how to drill a hole large than
1/2″ in diameter on a lathe.
4. Demonstrate how boring is done on a lathe.
5. Demonstrate the use of a mandrel.
Chapter 28 Other Lathe Operations 461