Siemens SINUMERIK 840Di sl Programming Manual page 209
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Continuous-path mode, G64
In continuous-path mode, the tool travels across tangential contour transitions with as
constant a path velocity as possible (no deceleration at block boundaries). Look Ahead
deceleration takes place before corners (G9) and blocks with exact stop ("Look Ahead", see
following pages).
Corners are also traversed at a constant velocity. In order to minimize the contour error, the
velocity is reduced according to an acceleration limit and an overload factor.
Reference:
/FB1/ Function Manual Basic Functions; Continuous Path Mode, Exact Stop and
Look Ahead (B1)
Note
The overload factor can be set in the MD32310. The extent of smoothing of the contour
transitions depends on the feedrate and the overload factor. With G641, you can specify the
desired rounding area explicitly.
Smoothing cannot and should not replace the functions for defined smoothing (RND, RNDM,
ASPLINE, BSPLINE, CSPLINE).
Continuous-path mode with programmable transition rounding, G641
With G641, the control inserts transition elements at contour transitions. With ADIS=... or
ADISPOS=..., you can specify the extent, to which the corners are rounded. The effect of
G641 is similar to RNDM; however, it is not restricted to the axes of the working plane.
Example: N10 G641 ADIS=0.5 G1 X... Y...
The rounding block must begin 0.5 mm before the programmed end of block at the earliest
and must be finished 0.5 mm after the end of the block. This setting remains modal.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
5.3 Continuous-path mode (G64, G641, G642, G643, G644)
Path Action
209
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