Thread Turning (Cycle99) - Siemens sinumerik 840D sl Operating Manual

Parameters
U or UX
UZ
8.2.6

Thread turning (CYCLE99)

Function
You can use the "Longitudinal thread", "Tapered thread" or "Face thread" cycle to turn
external or internal threads with a constant or variable pitch.
There may be single or multiple threads.
For metric threads (thread pitch P in mm/rev), the cycle assigns a value (calculated on the
basis of the thread pitch) to the thread depth H1 parameter. You can change this value.
The default must be activated via setting data SD 55212
$SCS_FUNCTION_MASK_TECH_SET.
The cycle requires a speed-controlled spindle with a position measuring system.
Thread re-machining
You have the option of subsequently machining threads. To do this, change into the "JOG"
operating mode and carry out a thread synchronization.
See also
Setting data for cycles (Page 186)
Thread synchronizing (Page 104)
Approach/retraction
1. The tool moves to the starting point calculated internally in the cycle at rapid traverse.
2. Thread with advance:
3. The first cut is made with thread pitch P as far as the thread run-out LR.
Turning
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Description
Finishing allowance in X or finishing allowance in X and Z – (only for ∇ and ∇ +
∇∇∇)
Finishing allowance in Z – (only for UZ, ∇ and ∇ + ∇∇∇)
Machine manufacturer
Please refer to the machine manufacturer's specifications.
The tool moves at rapid traverse to the first starting position displaced by the thread
advance LW.
Thread with run-in:
The tool moves at rapid traverse to the starting position displaced by the thread run-in
LW2.
Programming technology functions (cycles)
8.2 Rotate
Unit
mm
mm
291