HEIDENHAIN ITNC 530 User Manual page 346

Nominal diameter Q335: Nominal thread diameter.
Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+= right-hand thread
– = left-hand thread
Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread.
Threads per step Q355: Number of thread revolutions
by which the tool is offset:
0 = one helical line to the thread depth
1 = continuous helical path over the entire length of
the thread
>1 = several helical paths with approach and
departure; between them, the TNC offsets the tool by
Q355, multiplied by the pitch
Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min.
Climb or up-cut Q351: Type of milling operation with
M03.
+1 = climb milling
–1 = up-cut milling
346 8 Programming: Cycles