Machining Fundamentals 160
11.1 Metal-Cutting Power Saws
The fi rst step in most machining jobs is to cut
the stock to required length. This can be done using
power saws, Figure 11-1.
There are three principal types of metal-cutting
saws, Figure  11-2. Reciprocating-type power saws
use a back-and-forth (reciprocating) cutting action.
The cutting is done on the backstroke. The blade is
similar to that found on a hand hacksaw, only larger
and heavier. Band-type power saws have a continu-
ous blade that moves in one direction. Circular-type
power saws have a round, fl at blade that rotates into
the work. A toothed blade, friction blade, or abrasive
blade may be used, depending on the material and
the operation.
alterfalter/Shutterstock.com
Figure 11-1. The first step in most machining jobs is to cut
the stock to the desired length. Measure the cutoff length
carefully and observe all safety precautions.
Lifts slightly on forward
noncutting stroke
Abrasive cutoff
wheel, circular
toothed blade, or
circular no tooth
blade (friction
cutting)
Cuts only on this stroke
Reciprocating-type power saw
Continuous cutting
Circular-type saw
Band-type power saw
Goodheart-Willcox Publisher
Figure 11-2. The three principal types of cutoff saws.