HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 130)

Fixed Cycles: Tapping / Thread Milling
4.9 HELICAL THREAD DRILLING/MILLING (Cycle 265, DIN/ISO: G265)
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TNC 640 | User's Manual Cycle Programming | 1/2015
Cycle parameters
Nominal diameter Q335: Nominal thread diameter.
Input range 0 to 99999.9999
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
Thread depth Q201 (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min. Input range 0 to 99999.9999
alternatively
FMAX, FAUTO
Depth at front Q358 (incremental): Distance
between tool tip and the top surface of the
workpiece for countersinking at front. Input range
-99999.9999 to 99999.9999
Countersinking offset at front Q359 (incremental):
Distance by which the TNC moves the tool center
away from the hole center. Input range 0 to
99999.9999
Countersinking Q360: Running the chamfer
0 = before thread milling
1 = after thread milling
Set-up clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
Coordinate of workpiece surface Q203 (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999