HEIDENHAIN TNC 640 - Page 710

Turning | Turning program functions (option 50)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Working with the facing slide
Refer to your machine manual.
The machine tool builder can provide his own cycles
for working with a facing slide. The standard functional
range is described below.
You machine tool builder can provide a feature with which you can
specify the position with an offset of the facing slide in X direction.
The datum always has to be in the spindle axis, however.
Recommended program structure:
1
Activate FUNCTION MODE TURN with facing slide
2 Move to safe position, if necessary
3 Shift the datum to the spindle axis
4
Activate and position the facing slide with FACING HEAD POS
5 Perform machining in ZX coordinate plane using turning cycles
6 Retract facing slide and move to home position
7 Deactivate facing slide
8
Switch over machining mode with FUNCTION MODE TURN or
FUNCTION MODE MILL
The coordinate plane is defined such that the X coordinates
describe the diameter of the workpiece and the Z coordinates the
longitudinal positions.
Deactivating the facing slide function
Deactivate the facing slide function as follows:
Press the SPEC FCT key
Press the TURNING PROGRAM FUNCTIONS soft
key
Press the FACING SLIDE soft key
Press the ENT key
Example
7 FUNCTION FACING HEAD OFF
Deactivating the facing slide