Table of Contents
Advertisement
Setting Spindle
Speed
To select the correct spindle speed (RPM) for a
milling operation, you will need to: 1) Determine
the spindle speed needed for the workpiece,
and 2) configure the belts to provide the closest
calculated speed.
Calculating Spindle Speed
1.
Use the table in Figure 31 to determine the
cutting speed or surface feet per minute
(SFM) required for the workpiece material.
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
information.
Figure 31. Cutting speed table for HSS cutting
tools.
2.
Measure the diameter of the cutting tool in
inches.
3.
Use the following formula to calculate the
required spindle speed RPM:
*
Recommended
Cutting Speed (FPM) x 12
Tool Dia. (in inches) x 3.14
*
Double if using carbide cutting tool
Model G0731 (Mfd. Since 01/17)
Cutting Speed (SFM)
300
150
100
80
50
90
80
40
50
60
50
300-800
300-500
Spindle
=
Speed
(RPM)
Setting Spindle Speed
Tools Needed
Open-End Wrenches 24mm .............................. 2
To set the spindle speed:
1.
DISCONNECT MACHINE FROM POWER!.
2.
Release motor pulley tension by loosening
the jam nut and then the tensioner bolt (see
Figure 32).
Figure 32. Tensioner bolt and jam nut location.
3.
Using the table in Figure 33, arrange the
belts to provide the best RPM for the cutting
operation.
PULLEY ARRANGEMENT
A
B
C
D
SPINDLE RPM CHART
A
B
I
950
1720
1110
II
3200
2050
III
Figure 33. Vertical milling machine RPM table.
4.
Retension the belts to the proper tension (see
Tensioning V-Belts on Page 35).
Qty
Tensioner Bolt
Jam
Nut
I
II
III
C
D
420
270
490
1410
-29-
Advertisement
Table of Contents
