Grizzly G0704 owner manual Calculating Spindle Speed, To determine the needed spindle speed

Calculating Spindle

Speed

Closely follow the proper spindle speed and proper feed rate to produce good results, reduce undue strain on all moving parts and increase operator safety.

Prior to milling, determine the spindle speed needed to cut your workpiece, then set the speed on the machine.

To determine the needed spindle speed:

1.Use the table in Figure 23 to determine the cutting speed required for the material of your workpiece.

2.Measure the diameter of your cutting tool in inches.

3.Use the following formula to determine the needed spindle RPM for your operation:

(Cutting Speed x 4) /Tool Diameter = RPM

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Cutting Speeds for High Speed Steel (HSS)

Cutting Tools

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

Note: For carbide cutting tools, double the cut- ting speed. These values are a guideline only. Refer to the MACHINERY'S HANDBOOK for more detailed information.

Figure 23. Cutting speed table for HSS cutting

tools.

Model G0704 (Mfg. since 09/09)