Figure 33.
Parts of a file.
(b) Double cut. Double cut files (fig 34) have two sets of diagonal
rows of teeth. The first set of teeth is called the overcut. On the top of the
overcut set, a second set is made crossing the first. The second set is called the
upcut and is not as coarse or as deep as the overcut.
Figure 34.
File teeth characteristics.
(c) Rasp cut. Rasp cut files (fig 34) are made by a single pointed tool
or punch which forms each short tooth separately. Teeth are formed consecutively,
side by side, to form a line or a row of teeth.
(2) File teeth spacing.
The number of teeth per inch spacing (fig 34)
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 a rough, coarse, bastard (medium coarse), second cut, smooth cut, and dead
smooth grade teeth. For fast removal of metal or for rough work, the rough coarse
and bastard files are used.
For finishing, the second cut (small teeth), smooth
cut (very small teeth), and the dead smooth (very fine teeth) are used.
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