Grizzly G4791 owner manual Setting Lathe Speed, Calculating Correct Spindle Speed

Setting Lathe Speed

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Calculating Correct Spindle Speed

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Note: Cutting speeds are expressed in sur- face feet cut per minute (SFM).

Recommended Cutting Speeds

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Ldg`BViZg^Va	Rough Cuts	Finish Cuts
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8VhiHiZZa	,%	&*%
6aadnHiZZah=VgY	*%	&*%
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=^BV\VcZhZHiZZa	)%	&%%

Note: These values are based on HSS cutting tools. For carbide cutting tools, double the aver- age speed. These values are a guideline only. Refer to the MACHINERY’S HANDBOOK for more detailed information.

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Note: For this step, you will need to average out the diameters or work with the finished diameter.

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Cutting Speed (SFM) x 4

Spindle Speed =

Diameter of Cut

Example A

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Step 1:

&*%H;B[gdbX]Vgim)2+%%

Step 2:

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Result:

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Example B

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Step 1:

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Step 2:

&'%9ZiZgb^cZYH;Bm)2)-%

Step 3:

)-%$&9^VbZiZgd[Xji2)-%GEB

Result:

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