PART B - CARE AND USE OF POWER MACHINERY
2-13. Portable Power Saws. Electric circular saws are primarily used
for crosscutting or ripping and usually come equipped with a
combination rip and crosscut blade. Other blades are available for
cutting plywood, masonry, and hardboard.
a. Blade Sizes. The most commonly used blades are 7 1/4inch and
7 1/2inch blades. The diameter of the saw blade controls the depth
of cut that may be made with the saw.
b. Electric Handsaw. Figure 255 shows the parts of the electric
handsaw. Learn these parts and become very familiar with the
operation of the saw before trying to use it.
c. Circular Saw. The circular saw has a calibrated scale to
control the depth of the cut by raising or lowering the base shoe of
the saw. The saw may also be tilted to cut up to a 45degree bevel
cut. Figure 255 also shows the scale and tilt lock knobs.
d. Safety Guard. The operator is protected by a safety guard
(Figure 255), which is pushed back by the piece being cut and
returns automatically when the saw is removed from the work.
CAUTION
This safety device is of vital importance in preventing
bodily injuries. Do not be take it off, tie it, or jam it
back.
e. Ripping Fence. A very important accessory available for the
portable power saw is the ripping fence (or guide) (Figure 256),
which permits ripping of lumber to a predetermined width. It is used
to ensure an exact cut of a predetermined distance from the board
edge. Many carpenters reverse the hand position shown here in
ripping. Use the most comfortable position.
EN5155
2-30
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