Setting Rpm - Woodstock M1109 Owner's Manual

M1109 Combo Lathe/Mill

Setting RPM

When using the milling machine, determine the RPM
needed to cut your workpiece, and adjust the gear
change levers to achieve the closest RPM.
NOTICE
Never shift gears while lathe or mill is running; other-
wise, the gear teeth will be chipped or broken.
To determine and set the mill to the needed RPM, do
these steps:
1. Select the cutting speed required for the material of
your workpiece using the table in Figure 37.
2. Measure the diameter of your cutting tool in inches.
3. Use the following formula to determine the needed
RPM for your operation:
(Cutting Speed x 4) / Tool Diameter = RPM
Note: You will only be able to get an approximate
RPM value with the variable speed knob.
4. Move the mill gearbox levers to the nearest milling
speed RPM.
Failure to follow RPM and Feed Rate
Guidelines will put undue strain on
moving parts, shorten tool life, poor
workpiece results and may threaten
operator safety from ejected parts or
broken tools.
Cutting Speeds for High Speed Steel (HSS)
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 37. 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.
-33-
NOTICE
cutting tools:
Cutting Speed (sfm)
300
150
100
80
50
90
80
40
50
60
50
300-800
300-500