Siemens SINUMERIK 840D sl Operating Manual page 340

Programming technology functions (cycles)
8.2 Rotate
Parameter
U
NN
VR
Multiple threads
340
Description
Finishing allowance in X and Z – (only for ∇ and ∇ + ∇∇∇)
Number of noncuts - (only for ∇∇∇ and ∇ + ∇∇∇)
Return distance (inc)
No
α0 Starting angle offset
Yes
N Number of thread turns
The thread turns are distributed evenly across the periphery of the
turned part; the 1st thread turn is always located at 0°.
DA Thread changeover depth (inc)
First machine all thread turns sequentially to thread changeover
depth DA, then machine all thread turns sequentially to depth 2 ·
DA, etc. until the final depth is reached.
DA = 0: Thread changeover depth is not taken into account, i.e.
finish machining each thread before starting the next thread.
Machining:
Complete, or

from turn N1

N1 (1...4) start thread N1 = 1...N
only thread NX

NX (1...4) 1 from N threads
or
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Unit
mm
mm
Degrees
mm
Turning