BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
in such a way that they will form a continuous filing surface when held in a
straight line, but will separate from each other as they move around the
idler and drive wheels. The band file attachment provides a support behind
the file above the table, so that the band file cannot be forced backward by
the pressure of the workpiece as it is filed.
FIGURE 29.
A TYPICAL BAND FILE.
(a) Cut of File Teeth. Most files are classed as single-cut or double-
cut files according to the kind of teeth.
Single-cut files have rows of
parallel teeth extending across the face of the file at an angle. Double-
cut files have two rows of parallel teeth which cross each other. The first
row, usually cut at about a 45, angle, is coarser and deeper than the second
row which is generally cut at an angle of from 70, to 80,. Band files are
always of the double-cut type. Double cut files of medium pitch are called
bastard-cut files.
These files usually have between 12 and 24 teeth per
inch. Bastard-cut band files are commonly used for filing steel and other
hard metals on the bandsaw machine.
Short angle-cut files are double-cut
files in which the two rows of teeth have been cut at shorter angles than
those of the bastard-cut file.
Short angle-cut files are usually coarse
pitch, having 10 or 11 teeth per
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