Fig. 8 is a separating tool; Fig. 9 is an inside tool,
which should be made both right and left, and its point may be either
round, V shaped, or square. Fig. 24 shows the manner of holding an
inside tool. Fig. 10 is a tool for making curved undercuts. Fig. 11 is
a representative of a large class of tools for duplicating a given
form.
These figures represent a series of tools which may be varied
infinitely to adapt them to different purposes. The user, if he is
wide awake, is not long in discovering what angle to give the cutting
edge, what shape to give the point, and what position to give the tool
in relation to the work to be done.
Having had experience with hand tools it requires only a little
practice and observation to apply the same principles to slide rest
tools.
A few examples of this class of tools are given. Fig. 12 is the
ordinary diamond pointed tool, which should be made right and left.
The cutting edge may have a more or less acute angle, according to the
work to be done, and the inclined or front end of the tool may be
slightly squared or rounded, according to the work. Fig. 13 is a
separating tool, which is a little wider at the cutting edge than any
where else, so that it will clear itself as it is forced into the
work.
For brass this tool should be beveled downward slightly.
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