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G0484 Gear Head Mill/Drill
-19-
To determine and set the mill to the needed
cutting RPM
:
1. Select the cutting speed required for the
material of your workpiece using the table in
Figure 15.
NOTICE
Failure to follow RPM and Feed Rate
Guidelines will shorten cutter life and give
poor workpiece results and may threaten
operator safety from ejected parts or broken
tools.
Choosing Spindle
RPM
Never shift gears while mill/drill or mill is
running; otherwise, the gear teeth will be
chipped or broken.
NOTICE
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
2. Measure the diameter of your cutting tool in
inches.
3. Use the following formula to determine the
needed RPM for your operation:
Note: You will only be able to get an approxi-
mate RPM value with the gearbox range and
reduction levers.
4. Move the mill gearbox levers to the nearest
milling speed RPM.
Figure 15. High speed steel cutting chart.
Note:
Double the cutting speed for carbide
cutting tools. These values are a guideline
only. Refer to the MACHINERY'S HANDBOOK
for more detailed information.