Choosing Spindle Rpm - Grizzly G0484 Owner's Manual

Choosing Spindle
RPM
NOTICE
Never shift gears while mill/drill or mill is
running; otherwise, the gear teeth will be
chipped or broken.
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.
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
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.
G0484 Gear Head Mill/Drill
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
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.
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.
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