Grizzly G9979 owner manual Blade Pitch TPI, To select the correct blade pitch

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.

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.

Material Width/Diameter

Material Shapes

Teeth Per Inch (TPI) for Variable Pitch Blades

	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	2½	3	3½		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
		Tube		(54) (67)				Tool Steel			(29) (65)			Hardened					(75)		Austenitic				(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 20. General guidelines for blade selection and speed chart.

G8144Z/G8145Z/G8146Z	-25-
(Manufactured Since 6/11)