HEIDENHAIN TNC 320 (340 551-01) User Manual
Page 200
200
8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing,
T
apping and Thr
ead Milling
8
Set-up clearance
Q200 (incremental value): Distance
between tool tip (at starting position) and workpiece
surface.
8
Total hole depth
Q201 (incremental value): Distance
between workpiece surface and end of thread.
8
Pitch
Q239
Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+ = right-hand thread
– = left-hand thread
8
Workpiece surface coordinate
Q203 (absolute
value): Coordinate of the workpiece surface.
8
2nd set-up clearance
Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
Retracting after a program interruption
If you interrupt program run during thread cutting with the machine
stop button, the TNC will display the soft key MANUAL OPERATION.
If you press the MANUAL OPERATION key, you can retract the tool
under program control. Simply press the positive axis direction button
of the active tool axis.
Example: NC blocks
26 CYCL DEF 207 RIGID TAPPING NEW
Q200=2
;SET-UP CLEARANCE
Q201=-20
;DEPTH
Q239=+1
;PITCH
Q203=+25
;SURFACE COORDINATE
Q204=50
;2ND SET-UP CLEARANCE