Polynomial Interpolation (Poly, Polypath, Po, Pl) - Siemens Sinumerik 840D sl Programming Manual

Special Motion Commands

4.5 Polynomial interpolation (POLY, POLYPATH, PO, PL)

4.5 Polynomial interpolation (POLY, POLYPATH, PO, PL)
Function
It actually involves a polynomial interpolation (POLY) and not a spline interpolation type. Its
main purpose is to act as an interface for programming externally generated spline curves
where the spline sections can be programmed directly.
This mode of interpolation relieves the NC of the task of calculating polynomial coefficients. It
can be optimally applied in cases where the coefficients are supplied directly by a CAD
system or post processor.
Syntax
3rd degree polynomial:
POLY PO[X]=(xe,a2,a3) PO[Y]=(ye,b2,b3) PO[Z]=(ze,c2,c3) PL=n
5th degree polynomial and new polynomial syntax:
POLY X=PO(xe,a2,a3,a4,a5) Y=PO(ye,b2,b3,b4,b5) Z=PO(ze,c2,c3,c4,c5)
PL=n
POLYPATH("AXES","VECT")
Note
The sum of the polynomial coefficients and axes programmed in an NC block must not
exceed the maximum permitted number of axes per block.
Meaning
POLY :
POLYPATH :
PO[axis identifier/variable] :
X, Y, Z :
xe, ye, ze :
262
Activation of polynomial interpolation with a
block containing POLY.
Polynomial interpolation can be selected for
both AXIS or VECT axis groups
End points and polynomial coefficients
Axis identifier
Specification of end position for the particular
axis; value range as for path dimension
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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