HEIDENHAIN TNC 426 (280 476) User Manual
Page 246
HEIDENHAIN TNC 426, TNC 430
219
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
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2nd set-up clearance
Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
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Decrement
Q212 (incremental value): Value by which
the TNC decreases the plunging depth Q202 after
each infeed.
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No. of breaks before retracting
Q213: Number of
chip breaks after which the TNC is to withdraw the
tool from the hole for chip release. For chip breaking,
the TNC retracts the tool each time by the value
Q256.
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Minimum plunging depth
Q205 (incremental value): If
you have entered a decrement, the TNC limits the
plunging depth to the value entered with Q205.
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Dwell time at depth
Q211: Time in seconds that the
tool remains at the hole bottom
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Retraction feed rate
Q208: Traversing speed of the
tool in mm/min when retracting from the hole. If you
enter Q208 = 0, the tool retracts at the feed rate in
Q206.
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Retraction rate for chip breaking
Q256
(incremental value): Value by which the TNC retracts
the tool during chip breaking