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

Programming technological functions (cycles)
10.4 Turning - milling/turning machine
Hidden parameters
The following parameters are hidden. They are pre-assigned fixed values or values that can
be adjusted using setting data.
Parameter Description
PL Machining plane
G Change in thread pitch per revolution – (only for P = mm/rev
or in/rev):
Without change in thread pitch
VR Return distance
Multiple threads 1 thread
α0 Starting angle offset
10.4.7

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.
● With a constant infeed depth, the cutting cross-section increases from cut to cut. The
finishing allowance is machined in one cut after roughing.
A constant infeed depth can produce better cutting conditions at small thread depths.
● With a constant cutting cross-section, the cutting pressure remains constant over all
roughing cuts and the infeed depth is reduced.
The feedrate override has no effect during traversing blocks with thread. The spindle override
must not be changed during the thread machining.
508
Machine manufacturer
Please observe the information provided by the machine manufacturer.
Value Can be set in SD
Defined in MD
52005
0
No
0°
Operating Manual, 05/2017, A5E40868956
x
Milling