Siemens SINUMERIK 840D sl Function Manual page 177

Orientation tolerance
To specify an orientation tolerance, the setting data:
SD42466 $SC_SMOOTH_ORI_TOL (max. tolerance of the tool orientation for rounding)
This setting data defines the maximum rounding tolerance for the tool orientation The data
determines the maximum permissible angular deviation of the orientation of the tool. This
data is only effective if an orientation transformation is active.
Possible combinations
The following table indicates for G642 and G643 the effect of axis tolerances in the following
machine data:
MD33100 $MA_COMPRESS_POS_TOL (maximum tolerance with compression)
It also applies to the setting data given above.
MD20480 SMOOTHING_MODE must be loaded with two decimal places as follows:
Value
0
1
2
3
4
Basic logic functions: Continuouspath Mode, Exact Stop, LookAhead (B1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
G642
Setting the value in the tens digit of the
machine data:
MD20480 $MC_SMOOTHING_MODE
(rounding behavior with G64x)
Axis-specific tolerances are used for G642.
These are set using the axis-specific
machine data: MD33100 (default value).
When rounding geometry axes with G642,
the following contour tolerance is used:
SD42465 $SC_SMOOTH_CONTUR_TOL
(maximum contour tolerance when
rounding)
The remaining axes are rounded using the
axisspecific tolerances in the machine data:
MD33100.
The orientation movement with G642 is
rounded using the angle tolerance:
SD42466 $SC_SMOOTH_ORI_TOL (max.
tolerance of the tool orientation for
rounding).
All the other axes use the axis-specific
tolerances in the machine data: MD33100.
Combination of the two options 1x and 2x.
i.e., the following tolerances are used for
G642: SD42465 and SD42466.
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.
Detailed description
2.3 Continuous -path mode
G643
(Setting the value in the ones digit of the
machine data:
MD20480 $MC_SMOOTHING_MODE
(rounding behavior with G64x)
Axis-specific tolerances are used for G643.
These are set using the axis-specific
machine data: MD33100 (default value).
When rounding geometry axes with G643,
the following contour tolerance is used:
SD42465 $SC_SMOOTH_CONTUR_TOL
(maximum contour tolerance when
rounding).
The remaining axes are rounded using the
axisspecific tolerances in the machine data:
MD33100.
The orientation movement with G463 is
rounded using the angle tolerance:
SD42466 $SC_SMOOTH_ORI_TOL (max.
tolerance of the tool orientation for
rounding).
All the other axes use the axis-specific
tolerances in the machine data: MD33100.
Combination of the two options 1x and 2x.
i.e., the following tolerances are used for
G643: SD42465 and SD42466.
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.
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