Setting Rpm - Woodstock M1109 Owner's Manual

Setting RPM

To determine and set the needed cutting RPM, do
these steps:
1. Use the table in Figure 37 to determine the cutting
speed required for the workpiece material.
2. Determine the average final diameter of the
workpiece in inches, for the cut to be made.
Failure to follow RPM and feed rate guidelines may
threaten operator safety from ejected parts or bro-
ken tools.
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
-26-
M1109 Combo Lathe/Mill
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
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 37. Cutting speed table for HSS
cutting tools.
RPM Lever
RPM/Range Chart
38
Figure . Spindle speed selector levers.
Cutting Speed
(sfm)
300
150
100
80
50
90
80
40
50
60
50
300-800
300-500
Range
Lever