HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 250)

250 8 Programming: Cycles
8.2 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
 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.
 Total hole depth Q356 (incremental value): Distance
between workpiece surface and bottom of hole.
 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
 Plunging depth Q202 (incremental value): Infeed per
cut. The depth does not have to be a multiple of the
plunging depth. The TNC will go to depth in one
movement if:
„ the plunging depth is equal to the depth
„ the plunging depth is greater than the depth
 Upper advanced stop distance Q258 (incremental
value): Set-up clearance for rapid traverse positioning
when the TNC moves the tool again to the current
plunging depth after retraction from the hole.
 Infeed depth for chip breaking Q257 (incremental
value): Depth at which TNC carries out chip breaking.
There is no chip breaking if 0 is entered.
 Retraction rate for chip breaking Q256
(incremental value): Value by which the TNC retracts
the tool during chip breaking.
 Depth at front Q358 (incremental value): Distance
between tool tip and the top surface of the workpiece
for countersinking at the front of the tool.
 Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the hole center.
X
Y
Q207
Q335
X
Z
Q203
Q239
Q201
Q204 Q200
Q253
Q202
Q257
Q356
X
Z
Q359 Q359
Q358