Woodstock SHOP FOX M1001 - Manual (Page 24)

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M1001 6" x 26" Vertical Mill
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ATIO
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Before changing speeds, you must first determine the
best RPM to use with the material and diameter of your
cutting tool. Using this determined RPM, you can then set
the mill to match that speed.
To determine the RPM needed for your workpiece, do
these steps:
1. Use the chart in Figure 22 to determine the cutting
speed for your workpiece material.
2. Measure the diameter of your cutting tool in inches.
3. Use the following formula in Figure 23 to determine
the best RPM for your operation.
Note: Always round to the closest RPM given on the
spindle speed chart.
Example 1
You have a piece of aluminum stock, and you are
using a 1/2" diameter HSS cutting tool.
Step 1:
300 (SFM from chart) x 4 = 1200
Step 2:
1200 / .5" (Diameter of cutting tool) = 2400 RPM
Result:
The best speed for this workpiece is 2400 RPM.
Example 2
You have a piece of stainless steel, and you are
using a 1" diameter carbide cutting tool.
Step 1:
60 (SFM from chart) x 2 (for carbide tool) = 120
Step 2:
120 (determined SFM) x 4 = 480
Step 3:
480 / 1" (Diameter of cutting tool) = 480 RPM
Result:
The best speed for this workpiece is 480 RPM.
Determining Needed RPM
Figure 22. Cutting speed chart for HSS
cutting tools.
Figure 23. Formula to determine required
RPM.
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
*For carbide cutting tools, double the cutting
speed. These values are a guideline only. Refer to
the current edition of MACHINERY'S HANDBOOK for
more detailed information.