HEIDENHAIN TNC 426, TNC 430 251
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 Threads per step Q355: Number of thread
revolutions by which the tool is offset, see figure at
lower right 0 = one 360° helical path to the depth of
thread
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 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
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