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TM 9-254
4-22.
Files - Continued
(3)
When working on cast iron, start with a bastard cut file and finish with a second cut file.
(4)
When filing soft metal, start with a second cut file and finish with a smooth cut file.
(5)
When filing hard steel, start with a smooth cut file and finish with a dead smooth file.
(6)
When filing brass or bronze, start with a bastard file and finish with a second or smooth cut file.
(7)
When filing aluminum, lead, or babbitt metal, use a bastard cut curved-tooth file.
(8)
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.
c.
Method of Filing (fig. 4-48). The following procedure is recommended when filing:
(1)
Clamp the work securely in a vise so that the area to be filed is parallel to and projecting slightly above
the vise jaws.
(2)
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 4-48.
Figure 4-48. Normal Filing Procedures
4-53
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