Hyd-Mech H-40, Operation And Maintenance Manual

Page: 22 / 95

Pg 2.7
H40
STEP 2
DETERMINE OPTIMUM BLADE PITCH, TEETH PER INCH (T.P.I)
Selecting a blade with proper tooth pitch is important in order to acheive optimal cutting rates and good blade
life.
For cutting narrow or thin wall structual materials, a fine blade with many teeth per inch (T.P.I) is recommend-
ed. For wide materials a blade with a coarse pitch should be used.
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. Allowance for the use of a non-optimum blade is made in STEP 4.
Optimum blade pitch, teeth per Optimum blade pitch, teeth per
Optimum blade pitch, teeth per Optimum blade pitch, teeth per
Optimum blade pitch, teeth per
inch (T.P.I.) for effective material inch (T.P.I.) for effective material
inch (T.P.I.) for effective material inch (T.P.I.) for effective material
inch (T.P.I.) for effective material
width, (in.). width, (in.).
width, (in.). width, (in.).
width, (in.).
SAW SETUP EXAMPLE
STEP 1
DETERMINE EFFECTIVE MATERIAL WIDTH, W (in.)
Effective material width, W (in.) for most comon
shapes of materials, is the widest solid part of the
material to be in contact with blade during cutting. For
simple shapes, as illustrated on the chart, this can be
directly measured. For bundles of tubes and structuals,
measuring the effective width is difficult. For those
cases effective width is 60% to 75% of te actual
material width.
Effective Material Width Effective Material Width Effective Material Width Effective Material Width Effective Material Width