USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
FIGURE 97.
FILE TEETH CHARACTERISTICS.
(2) File Teeth Spacing.
The number of teeth per inch of spacing
varies slightly with the make of file. The spacing also changes with the
file length, increasing proportionately as the length of the file is
increased. A file may have rough, coarse, bastard (medium coarse), second
cut, smooth cut, and dead smooth grade teeth. For fast removal of metal for
rough work, rough, coarse, and bastard files are used.
For finishing,
second cut (small teeth), smooth cut (smaller teeth), and the dead smooth
(very fine teeth) are used.
(3) File Shapes.
(a) Flat Files. A flat file is rectangular in cross section, is
slightly tapered towards the point in both width and thickness, and has
double-cut teeth. Both edges are cut.
(b) Hand Files. A hand file is similar to a flat file, but is of
uniform width and tapers only in thickness. It is double cut with one safe
or uncut edge.
(c) Square Files. A square file tapers slightly towards the point
on all four sides and is double cut.
(d) Round Files. A round file tapers slightly towards the point.
Bastard cut files, 6 inches and
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