HEIDENHAIN TNC 320 User Manual page 114

Cycle parameters
U
Nominal diameter Q335: Nominal thread diameter.
Input range 0 to 99999.9999
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
Input range -99.9999 to 99.9999
U
Thread depth Q201 (incremental): Distance between
workpiece surface and root of thread. Input range
-99999.9999 to 99999.9999
U Total hole depth Q356 (incremental): Distance
between workpiece surface and bottom of hole. Input
range -99999.9999 to 99999.9999
U Feed rate for pre-positioning Q253: Traversing
speed of the tool in mm/min when plunging into the
workpiece, or when retracting from the workpiece.
Input range 0 to 99999.999; alternatively FMAX,
FAUTO
U Climb or up-cut Q351: Type of milling operation with
M3
+1 = climb milling
–1 = up-cut milling
U Plunging depth Q202 (incremental): Infeed per cut.
The depth does not have to be a multiple of the
plunging depth. Input range 0 to 99999.9999. 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
U Upper advanced stop distance Q258 (incremental):
Set-up clearance for rapid traverse positioning when
the TNC moves the tool again to the current plunging
depth after retraction from the hole. Input range 0 to
99999.9999
U
Infeed depth for chip breaking Q257 (incremental):
Depth at which TNC carries out chip breaking. No chip
breaking if 0 is entered. Input range 0 to 99999.9999
U Retraction rate for chip breaking Q256
(incremental): Value by which the TNC retracts the
tool during chip breaking. Input range 0.1000 to
99999.9999
114 Fixed Cycles: Tapping / Thread Milling