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-22-
For Machines Mfg. Since 8/09
Model SB1021/SB1022
OPERATION
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
operation, contact the blade manufacturer.
To select the correct blade pitch:
1. Measure the material thickness. This
measurement is the length of cut taken
from where the tooth enters the workpiece,
sweeps through, and exits the workpiece.
2. Refer to the "Material Width/Diameter"
row of the blade selection chart in Figure
13, and read across to find the workpiece
thickness you need to cut.
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
various metals, given in feet per minute
(FPM). Choose the speed closest to the
number shown in the chart.
CUTTING SPEED RATE RECOMMENDATION
TOOTH SELECTION
50
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 192
1
/
2
3
1
/
2
75 100 150 200 250 300 350 400
2/3
2/3 1.4/2.5
1.5/.8
3/4
3/4
4/65/8
450
mm
inch
Copper
Alloy
229~482
(70) (147)
203~213
(62) (65)
85~203
(26) (62)
220
(67)
220~534
(67) (163)
203
(62)
85
(26)
321
(98)
180~220
(54) (67)
95~213
(29) (65)
242
(75)
65~85
(20) (26)
180~220
(54) (67)
75~118
(25) (36)
246
(75)
108~225
(33) (75)
196~354
(60) (108)
203
(62)
111~321
(34) (98)
150~203
(46) (62)
Aluminum
Alloy
Thin
Tube
Angle
Steel
Carbon
Steel
Speed FPM
(M/Min)
Speed FPM
(M/Min)
Speed FPM
(M/Min)
Speed FPM
(M/Min)
Material Material Material Material
Tool Steel
Mold Steel
High-Speed
Tool Steel
Alloy
Steel
Water
Hardened
Tool Steel
Stainless
Steel
CR Stainless
Steel
Free Machining
Stainless Steel
Gray
Cast Iron
Ductile
Austenitic
Cast Iron
Malleable
Cast Iron
Plastics
Cold-Work
Tool Steel
Hot-Work
Tool Steel
Oil~Hardened
Tool Steel
Material Width/Diameter
Material Shapes
Teeth Per Inch (TPI) for Variable Pitch Blades
Figure 13. General guidelines for blade selection and speed chart.