Siemens SINUMERIK 840D sl Programming Manual page 114

Feed control
7.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)
Traverse path axis as synchronized axis (FGROUP)
FGROUP is used to define whether a path axis should be traversed with path feedrate or as a
synchronized axis. In helical interpolation, for example, it is possible to 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: FGROUP(X,Y)
Change FGROUP
The setting made with FGROUP can be changed:
1. By reprogramming FGROUP: e.g. FGROUP(X,Y,Z)
2. By programming FGROUP without a specific axis: FGROUP()
In accordance with FGROUP(), the initial setting in the machine data applies: Geometry
axes are now once again traversed in the path axis grouping.
Note
With FGROUP, axis identifiers must be the names of channel axes.
Units of measurement for feedrate F
In addition to the geometrical settings G700 and G710, the G commands are also used to
define the measuring system for the feedrates F. In other words:
• For G700: [inch/min]
• For G710: [mm/min]
Note
G70/G71 have no effect on feedrate settings.
Unit of measurement for synchronized axes with limit speed FL
The unit set for F using G command G700/G710 is also valid for FL.
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals