Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 402
Spindles
Chapter 17
17-4
Each P-word corresponds to a specific axis assigned to it in AMP. Any
CSS axis changes made by programming a P-word in the G96 block
remain in effect regardless of what mode the control is in. The default
CSS axis is assigned to P0 and is active on power-up and after a control
reset.
Use this equation to calculate constant surface speed:
N = K V/D
RPM = Surface speed per minute / (.262 x diameter)
Where :
Is :
N
Spindle speed (rpm)
K
Constant 318.31 (1000/
p)
for metric system or 3.8197 (12/
p
) for inch system
V
Surface speed (m/min or feet/min)
D
Cutting diameter (mm or inch)
Figure 17.2 shows how the spindle speed changes as the cutting diameter
changes when:
constant K is 318.31
the necessary surface speed is 200 m/min
the maximum spindle speed is 3500 rpm