Siemens SINUMERIK 840D sl Programming Manual page 598

Work preparation
3.7 Special motion commands
Subprogram "contour" (includes the coordinates of the points along the curve):
Program code
N10 X20 Y18
N20 X10 Y21
N30 X6 Y31
N40 X18 Y31
N50 X13 Y43
N60 X22 Y42
N70 X16 Y58
N80 X33 Y51
N90 M1
In addition to the spline curve, resulting from the example program (ASPLINE), the following
diagram also contains the spline curves that would have been obtained when activating either
B or C spline interpolation (BSPLINE, CSPLINE):
Further information
Advantages of spline interpolation
With spline interpolation, the following advantages can be obtained contrary to using straight
line blocks G01:
● The number of part program blocks required to describe the contour are reduced
● Soft, curve characteristics that reduce the stress on the mechanical system at transitions
between part program blocks.
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Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming