Parameter Manual
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
147
Machine data
2.3 Channel-specific machine data
Description: Factor for permissible radius difference.
Defines the factor for large circles by which the starting radius and end
radius may deviate from each other
(see also MD21000 $MC_CIRCLE_ERROR_CONST (circle end point monitoring con-
stant).
When a circle is programmed, both conditions (that the distances from the
programmed center point to the start and end points (circle radius) must be
the same and that the center point of the circle must be located on the per-
pendicular bisector of the straight line connecting the start and end points
(perpendicular bisector of the circular plane)) apply.
The fact that the circular parameters can be freely programmed means that
these conditions are not usually met exactly in the case of circular-path
programming with I, J, and K (the circle is "overdefined").
The maximum permissible difference between the two radii that is accepted
without an alarm, as well as the distance between the programmied center
point of the circle and the perpendicular bisector described above, is
defined by the larger value in the following data:
• MD21000 $MC_CIRCLE_ERROR_CONST
• Start radius multiplied by MD21010 $MC_CIRCLE_ERROR_FACTOR
This means that for small circles the tolerance is a fixed value (MD21000
$MC_CIRCLE_ERROR_CONST), and for large circles it is proportional to the
start radius.
Related to:
MD21000 $MC_CIRCLE_ERROR_CO'NST
(circle end point monitoring factor)
In the context of the predefined tolerances, conflicting circle data is com-
pensated essentially by moving the center point of the circle. Please note
that the deviation between the programmed center point and the actual center
point can reach the order of magnitude set with machine data MD21000
$MC_CIRCLE_ERROR_CONST and/or MD21010 $MC_CIRCLE_ERROR_FACTOR. In the case
of circles which are almost full circles in particular, this can also lead to
contour deviations of the same order of magnitude.
21010 CIRCLE_ERROR_FACTOR C06 -
- Circle end point monitoring factor DOUBLE PowerOn
-
- - 0.001, 0.001, 0.001,
0.001, 0.001, 0.001...
0.0 - 2/2
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