Woodstock M1109 - Manual (Page 28)

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M1109 Combo Lathe/Mill
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Setting RPM
To determine and set the needed cutting RPM, do
these steps:
1. Use the table in Figure 37 to determine the cutting
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
Note: For carbide cutting tools, double
the cutting speed. These values are a
guideline only. Refer to the MACHINERY'S
HANDBOOK for more detailed informa-
tion.
Figure 38 . Spindle speed selector levers.
speed required for the workpiece material.
2. Determine the average final diameter of the
workpiece in inches, for the cut to be made.
3. Now use the following formula to determine the clos-
est RPM for the cutting operation:
(Cutting Speed x 4)
Diameter of Cut
4. With the calculated RPM, decide on the closest cut-
ting RPM to what you need.
5. Make sure the spindle is completely stopped
before proceeding.
6. Move the levers (Figure 38) to get the RPM range
that is closest to your calculated RPM:
• The range lever selects BLACK DOT = High or
RED DOT = Low.
• The RPM Lever selects the RPM within that range.
Note: You may need to rotate the chuck by hand to
get the gears to engage.
RPM Lever
Figure 37. Cutting speed table for HSS
cutting tools.
= RPM
Range
Lever
Failure to follow RPM and feed rate guidelines may
threaten operator safety from ejected parts or bro-
ken tools.
RPM/Range Chart