HEIDENHAIN TNC 410 ISO Programming - Manual (Page 230)

204 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing
, T
a
p
p
ing
and
Th
read Millin
g U U U U Set-up clearance Q200 (incremental value): Distance
between tool tip (at starting position) and workpiece
surface.
U U U U Total hole depth Q201 (incremental value): Distance
between workpiece surface and end of thread.
U U U U Pitch Q239
Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+ = right-hand thread
– = left-hand thread
U U U U Workpiece surface coordinate Q203 (absolute
value): Coordinate of the workpiece surface.
U U U U 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 MANUAL OPERATION soft key.
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 block
N26 G207 Q200=2 Q201=-20 Q239=+1
Q203=+25 Q204=50 *