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4
Fixed Cycles: Tapping / Thread Milling
4.7
THREAD MILLING/COUNTERSINKING (Cycle 263, DIN/ISO: G263)
Cycle parameters
Q335 Nominal diameter?: Thread inside diameter.
Input range 0 to 99999.9999
Q239 Pitch?: Pitch of the thread. The algebraic sign
differentiates between right-hand and left-hand
threads:
+
–= left-hand thread
Input range -99.9999 to 99.9999
Q201 Depth of thread? (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Q356 Countersinking depth? (incremental):
Distance between workpiece surface and tool tip.
Input range -99999.9999 to 99999.9999
Q253 Feed rate for pre-positioning?: Traversing
speed of the tool in mm/min when plunging into the
workpiece, or when retracting from the workpiece.
Input range 0 to 99999.9999 alternatively FMAX,
FAUTO
Q351 Direction? Climb=+1, Up-cut=-1: Type of
milling operation with M3
+1
–1
performed)
Q200 Set-up clearance? (incremental): Distance
between tool tip and workpiece surface Input range
0 to 99999.9999
Q357 Safety clearance to the side? (incremental):
Distance between tool tooth and the wall. Input
range 0 to 99999.9999
Q358 Sinking depth at front? (incremental):
Distance between tool point and the top surface of
the workpiece for countersinking at the front of the
tool. Input range -99999.9999 to 99999.9999
Q359 Countersinking offset at front?
(incremental): Distance by which the TNC moves
the tool center away from the center. Input range 0
to 99999.9999
112
= right-hand thread
= Climb
= Up-cut (if you enter 0, climb milling is
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016
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