Hyd-Mech S-20H, Operations & Maintenance Manua

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Pg 11
S22Hna 2002a
Optimum Blade Pitch ( T.P.I. ) for Material Width ( Inches )
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 fine, blade with many teeth per inch (T.P.I.)is recommended.
For wide materials a blade with a coarse pitch should be used. See the sketch below for the blade pitch changes
fordiffering effective material widths.
It is impractical to change the blade to the proper pitch every time a different width of material is cut and it is not
necessary, but remember that the optimum blade will cut most efficiently. Too fine 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.
(
140, 220 140, 220 140, 220 140, 220 140, 220
140, 220 140, 220
140, 220 140, 220
140, 220
90, 140 90, 140 90, 140 90, 140 90, 140
140, 220 140, 220
140, 220 140, 220 140, 220
90, 140 90, 140 90, 140 90, 140 90, 140
140, 220 140, 220 140, 220 140, 220 140, 220
140, 220 140, 220 140, 220 140, 220 140, 220
140, 220 140, 220
140, 220 140, 220
140, 220
310 310 310 310 310
220 220 220 220 220
( in SFM ) ( in SFM ) ( in SFM ) ( in SFM ) ( in SFM )