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Nominal position
value filter
December 2001
To attain a high machining velocity, the workpiece contour can be adapted to
the machine dynamics by means of a nominal position value filter. Here the
TNC always complies with the tolerance (MP1096, Cycle 32), the axis-specific
jerk (MP1097.x, MP1098.x), the acceleration (MP1060.x) and the radial
acceleration (MP1070.x).
The TNC calculates the filter parameters from the permissible axis-specific
jerk and the tolerance:
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Enter the permissible axis-specific jerk:
• For single filter: MP1097.x (at corners)
• For double filter: MP1098.x (at corners)
• For HSC filter: MP1098.x (at corners), as of NC software 280 476-01 you
can also enter for the HSC filter the permissible axis-specific jerk for
curvature changes (e.g. tangential transitions from a line to an arc) in
MP1097.x.
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In MP1096, define a tolerance for contour transitions. This tolerance can be
overwritten by the machine user with Cycle 32 "Tolerance."
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Select from the following tables the input values for MP1099.x or MP1094.
Note the lowest resonance frequency of your machine axes and the desired
damping at this frequency.
Note
The tolerance (MP1096, Cycle 32) always refers to the nominal value,
meaning the servo lag also affects the contour accuracy.
For example, if the servo lag S = 5 µm and the tolerance T = 10 µm, then
the total deviation is 15 µm.
The Control Loop
6 – 115
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