Siemens SINUMERIK 840DE Programming Manual page 255

Feedrate for synchronized axes
The feedrate F programmed at address F applies to all the path axes programmed in the
block, but not to synchronized axes. The synchronized axes are controlled such that they
require the same time for their path as the path axes, and all axes reach their end point at
the same time.
Traverse synchronized axes with limit speed FL
With this command, synchronized/path axes are traversed at their limit speed FL.
Traverse synchronized axes with path velocity F, FGROUP
With FGROUP, you define whether a path axis is to be traversed with path feed or as a
synchronized axis. In helical interpolation, for example, you can define that only two
geometry axes, X and Y, are to be traversed at the programmed feedrate. The infeed axis Z
is the synchronized axis in this case.
Example: N10 FGROUP(X, Y)
Change FGROUP
1. By reprogramming another FGROUP instruction.
2. With FGROUP () without axis parameter
Afterwards, the initial setting in the machine data applies – the geometry axes again traverse
in the path axis grouping.
Note
You must program channel axis names with FGROUP.
Caution
The FGREF evaluation also works if only rotary axes are programmed in the block. The
normal F value interpretation as degree/min applies in this case only if the radius reference
corresponds to the FGREF default, when
G71/G710: FGREF[A]=57.296
G70/G700: FGREF[A]=57.296/25.4
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Example: FGROUP(X, Y, Z)
Feedrate Control and Spindle Motion
7.1 Feedrate (G93, G94, G95 or F..., FGROUP, FGREF)
7-5