HEIDENHAIN TNC 430 - Page 267

HEIDENHAIN TNC 426, TNC 430 241
8.3 Cycles for Drilling, Tapping and Thread Milling
U Nominal diameter Q335: Nominal thread diameter
U Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+= right-hand thread
– = left-hand thread
U Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread
U Countersinking depth Q356 (incremental value):
Distance between tool point and the top surface of
the workpiece
U Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
U Climb or up-cut Q351: Type of milling operation with
M03
+1 = climb milling
–1 = up-cut milling
U Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface
U Set-up clearance to the side Q357 (incremental
value): Distance between tool tooth and the wall
U 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
U Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center