HEIDENHAIN iTNC 530 (340 420) - Manual (Page 285)

HEIDENHAIN iTNC 530 257
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
U U U U Nominal diameter Q335: Nominal thread diameter
U U U 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 U U U Thread depth Q201 (incremental value): Distance
between workpiece surface and root of thread
U U U U 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
U U U U Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
U U U U Climb or up-cut Q351: Type of milling operation with
M03
+1 = climb milling
–1 = up-cut milling