Table of Contents
Advertisement
Blade Pitch (TPI)
The chart below is a basic starting point for
choosing teeth per inch (TPI) for variable tooth
pitch blades and standard raker set bi-metal
blades/HSS blades. However, for exact specifica-
tions 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 mea-
surement 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 38, and
read across to find the workpiece thickness
you need to cut.
Material Width/Diameter
Material Shapes
TOOTH SELECTION
mm
50
inch
2
2½
CUTTING SPEED RATE RECOMMENDATION
Speed FPM
Material
Carbon
196~354
Steel
(60) (108)
Angle
180~220
Steel
(54) (67)
180~220
Thin
(54) (67)
Tube
220~534
Aluminum
(67) (163)
Alloy
Copper
Alloy
(70) (147)
Figure 38. General guidelines for blade selection and speed chart.
Model G0806/G0807 (Mfd. Since 12/15)
Teeth Per Inch (TPI) for Variable Pitch Blades
75
100
150
5/8
4/6
2/3
3/4
3
3½
4 5
6
Speed FPM
Material
(M/Min)
Tool Steel
High-Speed
Tool Steel
Cold-Work
Tool Steel
Hot-Work
Tool Steel
229~482
Oil-Hardened
Tool Steel
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
1.4/2.5
7
8
9
10
11
12
Material
(M/Min)
203
Alloy
(62)
Steel
75~118
Mold Steel
(25) (36)
Water
95~213
Hardened
(29) (65)
Tool Steel
203
Stainless
(62)
Steel
203~213
CR Stainless
(62) (65)
Steel
350
400
2/3
1.5/.8
13
14 15
16
17
Speed FPM
Material
(M/Min)
Free Machining
111~321
Stainless Steel
(34) (98)
246
Gray
(75)
Cast Iron
Ductile
242
Austenitic
(75)
Cast Iron
85
Malleable
(26)
Cast Iron
85-203
Plastics
(26) (62)
450
18
19
Speed FPM
(M/Min)
150~203
(46) (62)
108~225
(33) (75)
65~85
(20) (26)
321
(98)
220
(67)
-33-
Advertisement
Table of Contents
