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(% Use the table in =`^li\)/to determine the cutting speed required for the material of your workpiece.

)% Measure the diameter of your workpiece in inches and subtract the depth of the cut that will be taken on the initial pass.

*% Use the formula in =`^li\)0 to determine the needed RPM for your operation.

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You have a piece of 1⁄2" diameter aluminum stock, and you are using workpiece with a HSS cutting tool.

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300 (SFM from chart) x 4 = 1200

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1200 / 0.5" (Diameter of workpiece) = 2400 RPM

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The needed speed for this workpiece is 2400 RPM.

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You have a piece of 1" diameter stainless steel stock, and you are using a workpiece with a carbide cutting tool.

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60 (SFM from chart) x 2 (for carbide tool) = 120

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120 (determined SFM) x 4 = 480

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480 / 1" (Diameter of workpiece) = 480 RPM

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The needed speed for this workpiece is 480 RPM.

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Workpiece Material	Cutting Speed
	(sfm)
Aluminum & alloys	300
Brass & Bronze	150
Copper	100
Cast Iron, soft	80
Cast Iron, hard	50
Mild Steel	90
Cast Steel	80
Alloy Steel, hard	40
Tool Steel	50
Stainless Steel	60
Titanium	50
Plastics	300-800
Wood	300-500

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=`^li\)/% Cutting speed table for HSS

cutting tools.

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=`^li\)0% Formula to determine required

spindle speed for lathes.

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