HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 221)

HEIDENHAIN TNC 320 221
8.2 Cy
cles f
o
r Dr
illing,
T
apping and Thr
ead Milling
8 Nominal diameter Q335: Nominal thread diameter.
8 Thread pitch Q239: Pitch of the thread. The algebraic
sign differentiates between right-hand and left-hand
threads:
+ = right-hand thread
– = left-hand thread
8 Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread.
8 Threads per step Q355: Number of thread
revolutions by which the tool is offset, see figure at
lower right:
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.
8 Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min.
8 Climb or up-cut Q351: Type of milling operation with
M03.
+1 = climb milling
–1 = up-cut milling