Blade Pitch TPI | Southbend SB1021, SB1022 guide

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
		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
				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
	Material				(M/Min)		Material			(M/Min)	Material				(M/Min)		Material	(M/Min)
					(M/Min)					(M/Min)					(M/Min)			(M/Min)
	Carbon				196~354		Tool Steel		203			Alloy			111~321	Free Machining		150~203
		Steel			(60) (108)		Tool Steel		(62)			Steel		(34) (98)		Stainless Steel		(46) (62)
		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)		Mold Steel				(75)		Cast Iron	(33) (75)
		Steel			(54) (67)		Tool Steel		(25) (36)						(75)		Cast Iron	(33) (75)
			Thin		180~220		Cold-Work		95~213			Water			242		Ductile	65~85
			Thin		180~220		Cold-Work		95~213		Hardened				242	Austenitic		65~85
		Tube			(54) (67)		Tool Steel		(29) (65)		Hardened				(75)	Austenitic		(20) (26)
		Tube			(54) (67)		Tool Steel		(29) (65)		Tool Steel				(75)		Cast Iron	(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)			Plastics	(67)
		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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Blade Pitch (TPI)

To select the correct blade pitch:

TOOTH SELECTION

CUTTING SPEED RATE RECOMMENDATION

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