HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 432)

Programming: Turning Operations
14.2 Basis Functions (Software Option 50)
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TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
Program spindle speed
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.
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: Nominal speed when no constant cutting speed is active
(optional)
S MAX: Maximum speed with constant cutting speed (optional),
is reset with S MAX 0
gearrange: Gear range for the turning spindle (optional)
Defining the speed:
Show the soft-key row with special functions
Select the menu for TURNING PROGRAM
FUNCTIONS
Select FUNCTION TURNDATA
Select TURNDATA SPIN
Select the function for speed entry VCONST:
NC syntax
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
...