HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 177)

161 HEIDENHAIN TNC 410, TNC 426, TNC 430
ú Set-up clearance Q200 (incremental): Distance
between the tool tip (starting position) and the
workpiece surface; approximate value: 4x spindle
pitch
ú Total hole depth Q201 (thread length, incremental):
Distance between workpiece surface and end of
thread
ú Feed rate F Q206: Traversing speed of the tool during
tapping
The feed rate is calculated as follows: F = S x p,
where
F is the feed rate in mm/min),
S is the spindle speed in rpm,
and p is the thread pitch in mm
ú Dwell time at bottom Q211: Enter a value between 0
and 0.5 seconds to avoid wedging of the tool during
retraction.
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 tapping with the machine stop
button, the TNC will display a soft key with which you can retract the
tool.
Example NC block:
N25 G206 Q200=2 Q201=-20 Q206=150
Q211=0.25 Q203=+0 Q204=50*
8.3 Dr
illing Cy
cles
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