Setting Rpm - Grizzly G9901 Owner's Manual

setting rpm

Setting RPM
To select the proper RPM for your milling opera-
tion, you will need to: 1) determine the RPM need-
ed to cut your workpiece, 2) select the correct
spindle speed range, and 3) configure the spindle
speed controls for the right RPM.
Calculating RPM
1. Use the table in Figure 28 to determine the
cutting speed required for your workpiece
material.
Cutting Speeds for High Speed Steel (HSS)
Cutting Tools
Workpiece Material
Aluminum & alloys
Brass & Bronze
Copper
Cast Iron, soft
Cast Iron, hard
Mild Steel
Cast Steel
Alloy Steel, hard
Tool Steel
Stainless Steel
Titanium
Plastics
Wood
Note: For carbide cutting tools, double the cutting
speed. These values are a guideline only. Refer to
the MACHINERY'S HANDBOOK for more detailed
information.
Figure 28. Cutting speed table for HSS cutting
tools.
-32-
Cutting Speed (sfm)
300
150
100
80
50
90
80
40
50
60
50
300-800
300-500
2.
Measure the diameter of your cutting tool in
inches.
3.
Use the following formula to determine the
required RPM for you operation:
Selecting Spindle Speed Range
1. Make sure the mill is turned OFF, and the
spindle is stopped.
2.
Find the range in the charts below that
includes the spindle speed that you have cal-
culated for your workpiece.
Model G9901/G9902 Spindle Speed Ranges
(RPM)
Low Range (A)
High Range (B)
Figure 29. Model G9901/G9902 spindle speed
range chart.
Model G9903 Spindle Speed Ranges (RPM)
Low Range
High Range
Figure 30. Model G9903 spindle speed range
chart.
Model G9901/G9902/G9903 Milling Machine
78–278
670–2400
70–500
600–4200