Programming technology functions (cycles)
8.2 Rotate
Turning
324 Operating Manual, 03/2013, 6FC5398-8CP40-3BA1
Parameters Description Unit
Position
Form F machining position:
Undercut size according to DIN table:
e.g.: F0.6 x 0.3 (undercut form F)
X0 Reference point X ∅ mm
Z0 Reference point Z mm
X1 Allowance in X ∅ (abs) or allowance in X (inc) mm
Z1 Allowance in Z (abs) or allowance in Z (inc) – (for undercut form F only) mm
VX Cross feed ∅ (abs) or cross feed (inc) mm
* Unit of feedrate as programmed before the cycle call
8.2.5 Thread undercuts (CYCLE940)
Function
The "Thread undercut DIN" or "Thread undercut" cycle is used to program thread undercuts
to DIN 76 for workpieces with a metric ISO thread, or freely definable thread undercuts.
Approach/retraction
1. The tool first moves to the starting point calculated internally in the cycle at rapid traverse.
2. The first cut is made at the machining feedrate, starting from the flank and traveling along
the shape of the thread undercut as far as the safety distance.
3. The tool moves to the next starting position at rapid traverse.
4. Steps 2 and 3 are repeated until the thread undercut is finished.
5. The tool moves back to the starting point at rapid traverse.
During finishing, the tool travels as far as cross-feed VX.
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