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154577/2683-220 IC
5/17/02
Figure 17
WRONG
material weakens it sags, closing down the kerf and pinching the blade.
Cutting off a cantilevered or overhanging piece of material from the bottom
up in a vertical direction. The falling cut off piece can pinch the blade.
Cutting off long narrow strips (as in ripping). The cutoff strip can sag or
twist closing the kerf and pinching the blade.
Snagging the lower guard on a surface below the material being cut
momentarily reducing operator control. The saw can lift partially out of the
cut increasing the chance of blade twist.
Improper depth of cut setting on saw
Using the saw with an excessive depth of cut setting increases loading on
the unit and susceptibility to twisting of the blade in the kerf. It also
increases the surface area of the blade available for pinching under
conditions of kerf close down.
Blade twisting (Misalignment in Cut)
Pushing harder to cut through a knot, a nail, or hard grain area can cause
blade to twist.
Trying to turn the saw in the cut (trying to get back on the marked line) can
cause blade twist.
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Page 10
Figure 18
RIP FENCE
Extended reach or operating saw with poor body control (out of balance) can
result in twisting the blade.
Changing grip or body position while cutting can result in blade twist.
Backing unit up to clear blade can lead to twist if not done carefully.
Insufficient allowance for particularly tough materials
Materials that require extra attention: wet lumber, green lumber (material
freshly cut or not kiln dried), pressure treated lumber (material treated with
preservatives or anti-rot chemicals)
Use of dull or dirty blades
Dull blades cause increased loading of the saw. To compensate, an operator
will usually push harder which further loads the unit and promotes twisting
of the blade in the kerf. Worn blades may also have insufficient body
clearance which increases the chance of binding and increased loading.
Lifting the saw when making bevel cuts
Bevel cuts require special operator attention to proper cutting techniques -
especially guidance of the saw. Both blade angle to the shoe and greater
blade surface in the material increase the chance for binding and
misalignment (twist) to occur.
Restarting a cut with the blade teeth jammed against the material
10
Figure 19
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