HEIDENHAIN TNC 640 (34059x-01) - Manual (Page 418)

418 Programming: Turning Operations
13.2 Basis F
unctions (Sof
tw
ar
e Option 50)
Programming the speed
With turning you can machine both at constant spindle speed and
constant cutting speed.
If you machine at constant cutting speed VCONST:ON, the TNC modifies
speed according to the distance of the tool tip to the center of the
turning spindle. The TNC increases table speed with positioning in the
direction of the turning center and reduces speed with movements
away from the turning center.
For processing with constant spindle speed VCONST:OFF, speed is
independent of the tool position.
Use FUNCTION TURNDATA SPIN to define the speed. The TNC
now provides the following entry elements:
„ VCONST: Constant cutting speed on/off (obligatory)
„ VC: Cutting speed (optional)
„ S: Speed (optional)
„ GEARRANGE: Gear range for the turning spindle (optional)
Defining the speed:
U Show the soft-key row with special functions
U Select the menu for TURNING PROGRAM FUNCTIONS
U Select FUNCTION TURNDATA
U Select TURNDATA SPIN
U Select the function for speed entry VCONST:
NC syntax
S[1/min]
If you machine at constant cutting speed, the selected gear
range limits the possible spindle speed range. The possible
gear ranges (if applicable) depend on your machine.
3 FUNCTION TURNDATA SPIN VCONST:ON VC:100 GEARRANGE:2 Definition of a constant cutting speed in gear
range 2
3 FUNCTION TURNDATA SPIN VCONST:OFF S550 Definition of a constant spindle speed
...