Woodstock M1109 Manual Do Utilizador
-33-
M1109 Combo Lathe/Mill
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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.
Cutting Speeds for High Speed Steel (HSS)
cutting tools:
Workpiece Material Cutting Speed (sfm)
Aluminum & alloys
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
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.
NOTICE
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.