HEIDENHAIN TNC 620 User Manual page 197

Spindle speed S
The spindle speed S is entered in revolutions per minute (rpm) in a
T block (tool call). Instead, you can also define the cutting speed Vc
in meters per minute (m/min).
Programmed change
In the part program, you can change the spindle speed in a T block
by entering the new spindle speed only:
To program the spindle speed, press the S key on
the alphabetic keyboard.
Enter the new spindle speed
Changing during program run
You can adjust the spindle speed during program run with the
spindle speed potentiometer S.
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Entering tool-related data
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