Tc 9-524 fundamentals of machine tools

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TC 9-524
Using Steady Rest with Headstock Center
When it is not possible to hold the work in the chuck, you
can machine with one end supported by the headstock center
and the other end supported by the steady rest. Use a leather
strap or rawhide thong to tie the work to the driveplate and to
prevent it from moving off the headstock center, as shown in
Figure 7-107. Mount the work between centers and machine
the bearing surface. Set up the steady rest. With the work
mounted between the centers, tie the lathe dog, then remove
the tailstock center and perform the necessary machining,
Using the Follower Rest
Long slender shafts that tend to whip and spring while they
are being machined require the use of a follower rest (Figure
7-27). The follower rest is fastened to the carriage and moves
with the cutting tool. The upper jaw prevents the work from
climbing the cutting tool, The lower jaw prevents the work
from springing away from the cutting tool The follower rest
jaws are adjusted in the same manner as steady rest jaws. The
follower rest is often used when long, flexible shafts are
threaded, as shown in Figure 7-108, At the completion of
each threading cut, remove any burrs that may have formed
to prevent them from causing the work to move out of
alignment.
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TC 9-524
Chapter 8
MILLING OPERATIONS
Milling is the process of machining flat, curved, or
Milling machines are basically classified as vertical or
irregular surfaces by feeding the workpiece against a rotating
horizontal. These machines are also classified as knee-type,
cutter containing a number of cutting edges. The milling
ram-type, manufacturing or bed type, and planer-type. Most
machine consists basically of a motor driven spindle, which
milling machines have self-contained electric drive motors,
mounts and revolves the milling cutter, and a reciprocating
coolant systems, variable spindle speeds, and power-operated
adjustable worktable, which mounts and feeds the workpiece.
table feeds