HEIDENHAIN TNC 426 (280 476) User Manual
Page 268
HEIDENHAIN TNC 426, TNC 430
241
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
7
7
7
7
Nominal diameter
Q335: Nominal thread diameter
7
7
7
7
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
7
7
Countersinking depth
Q356 (incremental value):
Distance between tool point and the top surface of
the workpiece
7
7
7
7
Feed rate for pre-positioning
Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
7
7
7
7
Climb or up-cut
Q351: Type of milling operation with
M03
+1 = climb milling
–1 = up-cut milling
7
7
7
7
Set-up clearance
Q200 (incremental value): Distance
between tool tip and workpiece surface
7
7
7
7
Set-up clearance to the side
Q357 (incremental
value): Distance between tool tooth and the wall
7
7
7
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
7
7
7
7
Countersinking offset at front
Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center