USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
(e) When using a new file, do not apply too much pressure as the
teeth may break off.
(f) File slowly, lightly, and steadily.
Too much speed and too
much pressure causes the file to rock and will round off the corners of the
work.
(3) Draw Filing.
Draw filing is used to produce a very smooth and
true surface. To draw file, hold the file at right angles to the direction
of the strokes, with your hands close together, as shown in figure 100, to
prevent bending or breaking the file. Pressure should not be great and can
remain the same on the back stroke, as well as on the draw stroke.
The
speed of filing is not important. For extra smooth surfaces, wrap a piece
of emery cloth around the file and stroke in the same manner.
FIGURE 100.
DRAW FILING.
d. Care of Files.
(1) Breaking In. A new file should be broken in by using it first on
brass, bronze, or smooth iron.
Never use it first to remove the fins or
scales on cast iron.
Do not use a new file on a narrow surface, such as
sheet metal, because the narrow edge of the metal is likely to break off the
sharp points on the file teeth.
(2) Cleaning.
After using a new file, the teeth will clog up with
metal filings. Using a clogged file will scratch the work--this condition
is
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