Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 403)

Spindles
Chapter 17
17-5
Figure 17.2
Constant Surface Speed Mode (G96)
Chuck
Ж 200 Ж 100
3.
2.
1.
CAUTION: During the blocks when CSS mode (G96) is
active, the programmed S-word units are surface speed per
minute. For systems allowing multiple spindles, when CSS is
active, the S-word units for all spindles is surface speed per
minute. To maintain RPM units on the non-controlling
spindles, do not program them while CSS is active on the
controlling spindle.
Cutting Tool Position Cutting Diameter (mm) Spindle Speed (rpm)
1 200 318
2 100 636
3 0 3500 *
* The calculated spindle speed would be infinite because the diameter of
the workpiece at cutting position 3 is zero (0). However, since the
maximum spindle speed is set in AMP, the control sets the spindle speed at
this maximum value.