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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 1. Blade terminology.
a. blade size (diameter): the overall diameter
of the blade. the Model g0665 uses 10"
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.
-2-
the most important consideration when selecting
a blade for the Model g0665 is blade pitch (tpi).
proper tpi for any cut depends on the cross-
section size and wall thickness 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 stress applied to both
the blade and the workpiece (figure 2). use a
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 can hold. this buildup
of chips prevents the teeth from cutting effectively
and results in poor cutting efficiency, overheating,
and rapidly rounded off teeth (figure 3).
blade pitch
figure 2. TPI too coarse for workpiece.
figure 3. TPI too fine for workpiece.
g0665 Manual insert
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