possibilities are available for selecting the axes not contained in FGROUP on how they should
follow the FGROUP axes:
● Synchronous to path S (SPATH)
● Synchronous to curve parameter U (UPATH)
Syntax
SPATH
UPATH
Meaning
SPATH: The axes not contained in FGROUP are traversed with reference to path S
UPATH: The axes not contained in FGROUP are traversed with reference to curve parameter U
Note
UPATH and SPATH also define the interrelationship of the F word polynomial (FPOLY, FCUB,
FLIN) with path motion.
Boundary conditions
SPATH and UPATH have no meaning for:
● Linear interpolation (G1)
● Circular interpolation (G2, G3)
● Thread blocks (G33, G34, G35, G33x, G63)
● All path axes are contained in FGROUP
Example
The following example shows the difference between both types of motion control.
Program code
N10 FGROUP(X,Y,Z)
N15 G1 X0 A0 F1000 SPATH ; SPATH
N20 POLY PO[X]=(10,10) A10
Program code
N10 FGROUP(X,Y,Z)
N15 G1 X0 A0 F1000 UPATH ; UPATH
N20 POLY PO[X]=(10,10) A10
Work preparation
3.7 Special motion commands
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 611
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