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Blade pitch (tpi)
the chart below is a basic starting point for
choosing teeth per inch (tpi) for variable pitch
blades and standard raker set bi-metal blades/
hss blades. however, for exact specifications of
bandsaw blades that are correct for your opera-
tion, contact the blade manufacturer.
to select the correct blade pitch:
1.
Measure the material thickness. this mea-
surement is the distance from where each
tooth enters the workpiece to where it exits
the workpiece.
2.
refer to the "Material Width/diameter" row
of the blade selection chart in Figure 25, and
read across to find the workpiece thickness
you need to cut.
Material Width/diameter
Material shapes
TOOTH SELECTION
mm
50
4/6
inch
2
figure 25. general guidelines for blade selection and speed chart.
Model g0717 (Mfg. since 9/10)
teeth per inch (tpi) for Bandsaw Blades
75
100
150
5/8
4/6
3/4
2/3
3/4
2½
3
3½
4 5
6
3.
refer to the "Material shapes" row and find
the shape of the material to be cut.
4.
in the applicable row, read across to the right
and find the box where the row and column
intersect. listed in the box is the minimum
tpi recommended for the variable tooth pitch
blades.
5.
the "Cutting speed rate recommendation"
section of the chart offers guidelines for vari-
ous metals, given in feet per minute (FpM).
Choose the speed closest to the number
shown in the chart.
200
250
300
3/4
2/3
1.4/2.5
7
8
9
10
11
12
350
400
450
2/3
1.4/2.5
1.5/.8
13
14 15
16
17
1.5/.8
18
19
-25-
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