Cycle Parameters - HEIDENHAIN TNC 620 User Manual

Fixed Cycles: Tapping / Thread Milling | HELICAL THREAD DRILLING/MILLING (Cycle 265, DIN/ISO: G265,
software option 19)

Cycle parameters

Q335 Nominal diameter?: Thread nominal
diameter. Input range 0 to 99999.9999
Q239 Pitch?: 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
Q201 Depth of thread? (incremental): Distance
between workpiece surface and root of thread.
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
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
Q360 Countersink (before/after:0/1)? :
Execution of chamfer
0 = before thread milling
1 = after thread milling
Q200 Set-up clearance? (incremental): Distance
between tool tip and workpiece surface. Input
range 0 to 99999.9999
Q203 Workpiece surface coordinate? (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
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