Siemens SINUMERIK 840DE Programming Manual page 194

Path Action
5.3 Continuous-path mode (G64, G641, G642, G643, G644)
With G642, the rounding travel is determined based on the shortest rounding travel of all
axes. This value is taken into account when generating a rounding block.
Block-internal corner rounding with G643
The maximum deviations from the exact contour are specified for each axis by machine data
MD 33100: COMPRESS_POS_TOL[...] when a contour is smoothed with G643. No separate
rounding block is generated for G643; instead, axis-specific block-internal rounding motions
are inserted. In the case of G643, the rounding travel of each axis can be different.
Corner rounding with contour tolerance in G642 and G643
The expansions described in the following make the behavior with G642 and G643 more
precise and rounding with contour tolerance is introduced. With corner rounding in
conjunction with G642 and G643, the permissible deviations for each axis are normally
specified.
MD 20480: SMOOTHING_MODE can be used to configure rounding with G642 and G643
such that instead of the axis-specific tolerances a contour tolerance and an orientation
tolerance can be specified. In this case, the tolerance of the contour and of the orientation is
set using two independent setting data, which can be programmed in the NC program, so
that setting data can be specified differently for each block transition.
Setting data
SD 42465: SMOOTH_CONTUR_TOL
This setting data is used to define the maximum tolerance for the contour when rounding.
SD 42466: SMOOTH_ORI_TOL
This setting data is used to define the maximum tolerance for the contour when rounding for
the tool orientation (angle deviation).
This data is only effective if an orientation transformation is active. Very different
specifications for the contour tolerance and the tolerance of the tool orientation can only
have effect with G643.
Corner rounding with greatest possible dynamic response in G644
Corner rounding with greatest possible dynamic response is activated with G644 and with
MD 20480. SMOOTHING_MODE configured in the thousands position. The possible settings
are as follows:
0:
Input maximum axial deviations using MD 33100: COMPRESS_POS_TOL
1:
Input the maximum rounding path by programming ADIS=... or ADISPOS=...
5-12
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals