Settable Path Reference (Spath, Upath) - Siemens SINUMERIK 828D Programming Manual

4.6

Settable path reference (SPATH, UPATH)

Function
During polynomial interpolation, the user may require two different relationships between the
velocity determining FGROUP axes and the other path axes: The latter should either be
controlled, synchronized to the path S or synchronized to the curve parameter U of the
FGROUP axes.
Both types of path interpolation are used in different applications and can be set/switched
over using the two modal language commands
group.
Syntax
SPATH
UPATH
Meaning
SPATH
UPATH
Note
UPATH
with path motion.
General conditions
The path reference set is of no importance:
● for linear and circular interpolation
● in thread blocks
● if all path axes are contained in FGROUP.
Job planning
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
: Path reference for FGROUP axes is arc length
: Path reference for FGROUP axes is curve parameter
and also define the interrelationship of the F word polynomial (
SPATH
Special Motion Commands
4.6 Settable path reference (SPATH, UPATH)
and contained in the 45th G code
SPATH UPATH
, , )
FPOLY FCUB FLIN
257