-25-
g8144 z/g8 145z/ g8146 z
(Manufactured since 6/11)
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 20, and
read across to find the workpiece thickness
you need to cut.
CUTTING SPEED RATE RECOMMENDATION
TOOTH SELECTION
50
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 192½ 3½
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 20. general guidelines for blade selection and speed chart.
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.