2.16
STEP 3: DETERMINE OPTIMUM BLADE PITCH - TEETH PER INCH (T.P.I.)
Selecting a blade with proper tooth pitch is important in order to achieve optimal cutting rates and good blade life.
For cutting narrow or thin wall structural materials a ne blade with many teeth per inch (T.P.I.) is recommended. For wide
materials a blade with a coarse pitch should be used. The sketch can be referenced for the blade pitch changes for
diering eective material widths.
Optimum Blade Pitch (T.P.I) for Material Width (Inches)
It is impractical to change the blade to the proper pitch every time a dierent width of material is cut and it is not
necessary, but remember that the optimum blade will cut most eciently. Too ne a blade must be fed slower on wide
material because the small gullets between the teeth will get packed with chips before they get across and out of the cut.
Too coarse a blade must be fed slower because it has fewer teeth cutting and there is a limit to the depth of a cut taken by
each tooth. Allowance for the use of a non-optimum blade is made in STEP 5.
Example #1: Eective material width of 8” (200 mm):
Optimum blade has 2/3 teeth per inch.
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