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blade Terminology
selecting the right blade for the cut requires an
understanding of various blade characteristics.
blade Terminology
b
f
D
C
E
figure 13. blade terminology.
A. blade Size (Diameter): the overall diameter
of the blade. the Model g0692 uses 14"
blades.
b. pitch: the distance from the tip of one tooth
to the tip of the next. typically given in teeth
per inch (tpi).
C. Gullet: the shallow area between the tips of
the teeth.
D. front Rake Angle: the measurement of the
angle formed between the tip of the blade
tooth and a line tangent to the perimeter of
the blade.
E. Rear Rake Angle: the measurement of the
angle formed between the face of the tooth
and the diameter.
f.
Tooth Depth: the distance from the tip of
the tooth to the bottom of the corresponding
gullet.
G. Kerf: the width of the cut created by the
blade.
Model G0692 (Mfg. 11/08 and Later)
the most important consideration when selecting
a blade is blade pitch, which is typically measured
in "teeth per inch" (tpi). proper tpi for any cut
depends on the cross-section size and wall thick-
ness of the workpiece.
if the blade pitch is too coarse for the cut, there
will be too few teeth making the cut at any given
time. this results in broken blade teeth and rough
cuts due to excessive strain applied to both the
A
blade and the workpiece (figure 14). use a
blade pitch that keeps at least three teeth in the
workpiece at any time.
G
Conversely, if the blade pitch is too fine for the
cut, teeth will remain in the workpiece and remove
more material than the blade gullet can hold. this
buildup of chips prevents the teeth from cutting
effectively and results in poor cutting efficien-
cy, overheating, and rapid rounding-off of teeth
(figure 15).
blade pitch
Blade
(TPI Too Coarse)
Broken
Tooth Tip
Workpiece
figure 14. TPI too coarse for workpiece.
(TPI Too Fine)
Gullet
Excessive
Chip Buildup
figure 15. TPI too fine for workpiece.
Blade
Workpiece
-15-
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