ate is used, it
may be necessary to drill holes for the belt lacing, as shown.

[Illustration: Fig. 22. Shaft supported by Steadyrest for Drilling and
Boring End]

A hole is next drilled in the end of the rod by using a twist drill in
the tailstock. If the hole is finished by boring, a depth mark should
be made on the tool shank that will warn the workman of the cutting
end's approach to the bottom. A chuck can also be used in connection
with a steadyrest for doing work of this kind, as shown in Fig. 24, the
end of the rod being held and driven by the chuck _C_. If the piece is
centered, it can be held on these centers while setting the steadyrest
and adjusting the chuck, but if the ends are without centers, a very
good way is to make light centers in the ends with a punch; after these
are properly located they are used for holding the work until the
steadyrest and chuck jaws have been adjusted. In case it is necessary to
have the end hole very accurate with the outside of the finished rod, a
test indicator _I_ should be applied to the shaft as shown. This is an
instrument which shows with great accuracy whether a rotating part runs
true and it is also used for many other purposes in machine shops. The
indicator is held in the lathe toolpost and the contact point beneath
the dial is brought against the work. If the latter does not run true,
the hand of the indicator vibrates and the graduations on the dial show
how much the work is out in thousandths of an inch.

[Illustration: Fig. 23. Hold-back used when Outer End of Work is held in
Steadyrest]

=The Follow-rest.=--When turning long slender parts, such as shafts,
etc., a follow-rest is often used for supporting the work. The
follow-rest differs from the steadyrest in that it is attached to and
travels with the lathe carriage. The type illustrated to the right in
Fig. 19 has two adjustable jaws which are located nearly opposite the
turning tool, thus providing support where it is most needed. In using
this rest, a cut is started at the end and the jaws are adjusted to this
turned part. The tool is then fed across the shaft, which cannot spring
away from the cut because of the supporting jaws. Some follow-rests
have, instead of jaws, a bushing bored to fit the diameter being turned,
different bushings being used for different diameters. The bushing forms
a bearing for the work and holds it rigidly. Whether a bushing or jaws
are used, the turning tool is slightly in