HEIDENHAIN TNC 426, User Manual

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HEIDENHAIN TNC 426, TNC 430 219
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
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.
U Decrement Q212 (incremental value): Value by which
the TNC decreases the plunging depth Q202 after
each infeed.
U 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.
U Minimum plunging depth Q205 (incremental value): If
you have entered a decrement, the TNC limits the
plunging depth to the value entered with Q205.
U Dwell time at depth Q211: Time in seconds that the
tool remains at the hole bottom
U 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.
U Retraction rate for chip breaking Q256
(incremental value): Value by which the TNC retracts
the tool during chip breaking