HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 180)

8 Programming: Cycles 164
ú Set-up clearance Q200 (incremental): Distance
between tool tip (at starting position) and workpiece
surface
ú Total hole depth Q201 (incremental): Distance
between workpiece surface (beginning of thread) and
end of thread
ú Thread pitch Q239
Pitch of the thread. The algebraic sign differentiates
between right-hand and left-hand threads:
+ = right-hand thread
– = left-hand thread
ú Workpiece surface coordinate Q203 (absolute value):
Coordinate of the workpiece surface
ú 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:
N26 G207 Q200=2 Q201=-20 Q239=+1
Q203=+0 Q204=50*
8.3 Dr
illing Cy
cles
Kkap8.pm6 29.06.2006, 08:06 164