HEIDENHAIN TNC 426 (280 476) User Manual
Page 274
HEIDENHAIN TNC 426, TNC 430
247
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
7
7
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7
Nominal diameter
Q335: Nominal thread diameter
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7
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Thread pitch
Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+= right-hand thread
–= left-hand thread
7
7
7
7
Thread depth
Q201 (incremental value): Distance
between workpiece surface and root of thread
7
7
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7
Feed rate for pre-positioning
Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
7
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7
Depth at front
Q358 (incremental value): Distance
between tool point and the top surface of the
workpiece for countersinking at the front of the tool
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Countersinking offset at front
Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center
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Countersink
Q360: Execution of the chamfer
0 = before thread machining
1 = after thread machining
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Set-up clearance
Q200 (incremental value): Distance
between tool tip and workpiece surface