d. Files and Rasps. A file is a steel instrument used for
cutting and smoothing metal and wood. A rasp is a very coarse file
that differs from an ordinary file in teeth size and shape. Figure
251 shows the types of files. Wood files are usually tempered to
work lead or brass; they should not be used on any harder surface.
When using a file, never allow it to drag on the backward stroke; it
cuts only on the forward stroke. When using a rasp, fix the work
firmly in a vise and grasp the rasp in both hands, with one hand
holding and the other applying a light pressure to the rod (Figure 2
52).
Figure 2-51.
Files and rasps
Figure 2-52.
Using a rasp
EN5155
2-28
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