Siemens SINUMERIK 840Di sl Operating Manual page 304

6
"Program" operating area
6.7 Free contour programming
6-304
The positive direction of rotation runs counter-clockwise.
If there are several input poles, the definitive pole is the last pole
before the input or edited element.
Incremental polar coordinates relate to both the definitive pole and the
end point of the preceding element.
For an incremental input, the absolute distance to the pole is
calculated using the absolute distance from the end point for the
preceding element to the pole plus the length increment that was
entered. The increment can be positive or negative.
The absolute angle is calculated accordingly using the absolute polar
angle of the preceding element plus the angular increment. Here it is
not necessary for the preceding element to have been entered as
polar.
In contour programming, the contour calculator converts the Cartesian
coordinates of the preceding end point using the definitive pole into
polar coordinates. This also applies if the preceding element has been
given in polar coordinates, since this could relate to another pole if a
pole has been inserted in the meantime.
SINUMERIK 840Di sl/840D sl/840D Operating Manual HMI-Advanced (BAD) - 01/2008 Edition
6
01/2008
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