USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
longer, are double cut. Second cut round files, 12 inches and longer, are
double cut; all others are single cut.
(e) Half-Round Files. A half-round file tapers towards the point
in width and thickness. The flat side of all half-round files is double cut
and is graded in coarseness like flat files. The round backs of all coarse
and bastard half-round files longer than 6 inches are double cut; the backs
of 4 and 6 inch files are single cut.
(f) Mill Files. A mill file is usually single cut and is tapered
in width and thickness for about a third of its length.
(g)
Pillar Files.
A regular or an extra narrow pillar file is
similar to a
hand file, except that it is narrower. Pillar files are double
cut with one
safe or uncut edge. Pillar files are of the same coarseness as
square files
of corresponding lengths.
(h) Triangular Files. The taper file tapers toward the point, is
usually single cut, and has edges that are set and cut for filing the gullet
between saw teeth.
The blunt handsaw file is of uniform width and
thickness; its teeth are similar to those of the taper file.
The three
sided file tapers towards the point, is double cut, and has fairly sharp
corners.
(i) Knife Files.
A knife file is shaped like a knife blade and is
double cut on both faces.
(j) Flat Float Files.
Flat float files are slightly tapered in
width and thickness and have a coarse single cut.
(k) Curved Tooth File.
The curved tooth file has single cut,
curved, milled teeth.
(l) Special Crosscut Saw File.
The special crosscut saw file is
single cut and of uniform width and thickness.
(m) Swiss Pattern Files.
Swiss pattern
files (figure 98 on the
following page) are small and delicate. The tang
is shaped into a handle.
They are most often used for fitting parts of
delicate mechanisms, for
filing work in instruments, and for tool and die
work.
They are made in
seven cuts;
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