Siemens SINUMERIK 840D sl Programming Manual page 837

feedrate values programmed non-modally that have an active FCUB. The feedrate values act
here as interpolation points for calculation of the spline interpolation.
Example:
N50 F1400 FCUB X50
N60 F2000 X47
N70 F3800 X52
F=FPO(...,...,...)
The feedrate characteristic is programmed directly via a polynomial. The polynomial
coefficients are specified according to the same method used for polynomial interpolation.
Example:
F=FPO(endfeed, quadf, cubf)
endfeed, quadf and cubf are previously defined variables.
endfeed:
quadf:
cubf:
With an active FCUB, the spline is linked tangentially to the characteristic defined via FPO at
the block beginning and block end.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Feed
Feedrate at block end
Quadratic polynomial coefficient
Cubic polynomial coefficient
3.14 Path traversing behavior
Path
Work preparation
837