Southbend SB1021, SB1022 manual Blade Pitch TPI, To select the correct blade pitch

Model SB1021/SB1022 O P E R A T I O N For Machines Mfg. Since 8/09

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.

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.

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.

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.

Material Width/Diameter

Teeth Per Inch (TPI) for Variable Pitch Blades

Material Shapes

TOOTH SELECTION

mm

50

75

100

150

200

250

300

350

400

450

5/8

4/6

3/4

2/3

3/4

2/3

1.4/2.5

1.5/.8

inch

2

21/2 3

31/2 4 5

6

7 8 9

10 11

12

13 14

15 16 17

18 19

CUTTING SPEED RATE RECOMMENDATION

Material

Speed FPM

Material

Speed FPM

Material

Speed FPM

Material

Speed FPM

(M/Min)

(M/Min)

(M/Min)

(M/Min)

Carbon

196~354

Tool Steel

203

Alloy

111~321

Free Machining

150~203

Steel

(60) (108)

(62)

Steel

(34) (98)

Stainless Steel

(46) (62)

Angle

180~220

High-Speed

75~118

Mold Steel

246

Gray

108~225

Steel

(54) (67)

Tool Steel

(25) (36)

(75)

Cast Iron

(33) (75)

Thin

180~220

Cold-Work

95~213

Water

242

Ductile

65~85

Hardened

Austenitic

Tube

(54) (67)

Tool Steel

(29) (65)

(75)

(20) (26)

Tool Steel

Cast Iron

Aluminum

220~534

Hot-Work

203

Stainless

85

Malleable

321

Alloy

(67) (163)

Tool Steel

(62)

Steel

(26)

Cast Iron

(98)

Copper

229~482

Oil~Hardened

203~213

CR Stainless

85~203

Plastics

220

Alloy

(70) (147)

Tool Steel

(62) (65)

Steel

(26) (62)

(67)

Figure 13. General guidelines for blade selection and speed chart.

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