Contour/Orientation Tolerance - Siemens SINUMERIK 828D Function Manual

3.6

Contour/Orientation tolerance

Parameter assignment for the contour/orientation tolerance
The maximum permissible contour deviation (contour tolerance) and the maximum permissible angular deviation
for the tool orientation (orientation tolerance) are defined in the machine data for every axis:
MD33100 $MA_COMPRESS_POS_TOL (maximum tolerance with compression)
The value set is valid both for the compressor functions and for the rounding functions with the exception of G641
(in this case, the distance to the block transition programmed with ADIS/ADISPOS applies).
Tolerance values from the following setting data may also be effective instead of MD33100:
SD42475 $SC_SMOOTH_CONTUR_TOL (maximum contour deviation)
SD42466 $SC_SMOOTH_ORI_TOL (maximum angular deviation of the tool orientation)
The manner in which the tolerance values from MD33100 and from the SD42645 and SD42466 setting data are
to be taken into consideration is set as follows:
• For the rounding functions - via the decimal places in the machine data:
MD20480 $MC_SMOOTHING_MODE (rounding behavior with G64x)
• For the compressor functions - via the ones position in the machine data:
MD20482 $MC_COMPRESSOR_MODE (mode of compression)
Further machine and setting data which are of relevance in contour and orientation tolerance settings are:
• MD33120 $MA_PATH_TRANS_POS_TOL (max. deviation when rounding with G645)
The value from MD33120 is effective when rounding block transitions with uniform tangents and non-uniform
curvature (e.g. circle/straight line transition) with G645.
• SD42676 $SC_ORI_SMOOTH_TOL
This setting data determines the tolerance when rounding the surface with OST.
• SD42678 $SC_ORISON_TOL
This setting data determines the tolerance when smoothing the orientation with ORISON.
Programming the contour/orientation tolerance
The machine and setting data described here take effect when the program is started and determine the
tolerances for all compressor functions, the rounding functions G642, G643, G645, OST, and the ORISON
orientation smoothing.
However, the NC program can overwrite these configured tolerances. The NC programmer has the following
commands at his/her disposal for this purpose:
Command
CTOL
OTOL
ATOL[<axis>]
CTOL and OTOL have priority over ATOL.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Syntax
CTOL=<value>
OTOL=<value>
ATOL[<axis>]=<value>
B1: Continuous­path Mode, Exact Stop, LookAhead
3.6 Contour/Orientation tolerance
Meaning
Contour tolerance
Orientation tolerance
Axis-specific tolerance
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