Tc 9-524 fundamentals of machine tools

Machining a Recess
To cut a recess, set up the lathe as in a boring operation.
Reference the face of the tool bit to the face of the work; then
move the tool bit forward the required distance to the recess
by using the micrometer stop or by using the compound rest
graduated collar. The compound rest must be set parallel with
the ways of the bed for this method. Add the width of the tool
bit into the measurement or the recess will not be cut
correctly. Position A (Figure 7-103) is the tool aligning to the
work, position B is set over to the front shoulder of the recess,
and position C is the set over to the back of the recess. Use the
cross slide graduated collar to measure the distance to move
the tool bit toward the operator. inside of the hole. Spindle
Recessing, sometimes called channeling or cambering, is
.
speed may have to be reduced due to the shape of the tool bit
the process of cutting a groove inside of a drilled, bored, or
causing chatter on the work. After cutting the recess, use
inside calipers to check the diameter.
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LATHE TOOL POST GRINDER
General
The tool post grinder is a portable grinding machine that can
be mounted on the compound rest of a lathe in place of the
tool post. It can be used to machine work that is too hard to
cut by ordinary means or to machine work that requires a very
fine finish. Figure 7-29 shows a typical tool post grinder. The
grinder must be set on center, as shown in Figure 7-104. The
centering holes located on the spindle shaft are used for this
purpose. The grinding wheel takes the place of a lathe cutting
tool. It can perform most of the operations that a cutting tool
is capable of performing. cylindrical, tapered, and internal
surfaces can be ground with the tool post grinder. Very small
grinding wheels are mounted on tapered shafts known as
quills to grind internal surfaces.