Siemens SINUMERIK 840Di Function Manual page 165

MD20480 SMOOTHING_MODE must be loaded with two decimal places as follows:
3
4
Differences between G642 - G643
With regard to their rounding behavior, commands G642 ad G643 differ as follows:
G642
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.
With G642, the rounding area results from the
smallest tolerance setting.
Constraints
Expansion to include contour tolerance and orientation tolerance exists only in systems with
options for polynomial interpolation. The orientation-transformation option is also required for
rounding orientations with angular tolerance specification.
Restriction for protection zones with active radius compensation and tool orientation:
Although tool radius compensation is applied for a tool orientation, which is not perpendicular
to one of the three datum planes of the basic coordinate system, the protection zones are
not rotated onto the corresponding plane.
For G643, MD 28530 MM_PATH_VELO_SEGMENTS must be greater than zero (> 0). If this
condition is satisfied, then MD 35240 ACCEL_TYPE_DRIVE must equal FALSE for all axes.
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Combination of the two options 1x and 2x.
i.e., the following tolerances are used for
G642:
SD42465 SMOOTH_CONTUR_TOL
and
SD42466 SMOOTH_ORI_TOL.
Further axes are rounded using the axis-
specific tolerance.
The rounding length programmed with
ADIS= or ADISPOS= is used for G642.
Any axis-specific tolerance or contour and
orientation tolerance specifications are
ignored.
2.3 Continuous-path mode
Combination of the two options 1x and 2x.
i.e., the following tolerances are used for
G643:
SD42465 SMOOTH_CONTUR_TOL
and
SD42466 SMOOTH_ORI_TOL.
Further axes are rounded using the axis-
specific tolerance.
The rounding length programmed with
ADIS= or ADISPOS= is used for G643.
Any axis-specific tolerance or contour and
orientation tolerance specifications are
ignored.
G643
In the case of G643, the rounding travel of each
axis can be different. The rounding travels are
taken into account axisspecifically and block-
internally.
Very different specifications for the contour
tolerance and the tolerance of the tool orientation
can only have effect with G643.
Detailed Description
2-17