USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
(f) When filing brass or bronze, start with a bastard cut file and
finish with a second- or smooth-cut file.
(g) When filing aluminum, lead, or babbitt metal, use a bastard-
cut, curved tooth file.
(h) For small work, use a short file; for medium sized work, use
an 8 inch file; for large work, use a file that is most convenient in
length.
(2) Method of Filing.
(a) Clamp the work securely in a vise so that the area to be filed
is horizontal and is parallel to and projecting slightly above the vise
jaws.
(b) Hold the file handle in one hand, thumb on top, and hold the
tip of the file with the fingers of the other hand, as shown in figure 99
below, and figure 102 on page 131).
FIGURE 99.
NORMAL FILING PROCEDURE.
(c) Apply pressure on the forward stroke only. Unless the file is
lifted from the work on the return stroke, it will become dull much sooner
than it should.
However, when filing soft metals, pressure on the return
stroke helps keep the cuts in the file clean of waste metal.
(d) Use a rocking motion when filing round surfaces.
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