Thread Chain (Cycle98) - Siemens SINUMERIK 840D sl Operating Manual

Programming technology functions (cycles)
8.2 Rotate
Parameter
D1 or ND
(only for ∇ and
∇ + ∇∇∇)
U
NN
VR
Multiple threads
8.2.7

Thread chain (CYCLE98)

Function
With this cycle, you can produce several concatenated cylindrical or tapered threads with a
constant pitch in longitudinal and face machining, all of which can have different thread
pitches.
There may be single or multiple threads. With multiple threads, the individual thread turns
are machined one after the other.
You define a right or left-hand thread by the direction of spindle rotation and the feed
direction.
The infeed is performed automatically with a constant infeed depth or constant cutting cross-
section.
336
Description
First infeed depth or number of roughing cuts
The respective value is displayed when you switch between the number of
roughing cuts and the first infeed.
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, 03/2013, 6FC5398-8CP40-3BA1
Unit
mm
mm
mm
Degrees
mm
Turning