July 2013 6.5 Tilting and swivel axes 755
Touch probe cycle
451 (MEASURE
KINEMATICS)
The MEASURE KINEMATICS cycle enables you to check and, if required,
optimize the kinematics of your machine. Use the 3-D TS touch probe to
measure any calibration sphere that you have attached to the machine table.
Angle optimization
In mode 1, only the position of a rotary axis in adapted. In mode 2, the position
and angular orientation are adapted.
The general angular position of a rotary axis can be calculated if a minimum of
two measuring points were probed per axis. Make sure that the measuring
circle radius is not too small. Otherwise, the repeatability of the system can
have a major influence on the result. The optimization of the angular position
of a rotary axis only makes sense if the angles within the desired traverse path
of the linear axes are relatively constant. If there are major changes in the
angles at different positions of the linear axes due to component errors of the
linear axes, the optimization of the angular position of the rotary axes is not
reasonable. An adjustment of the angular position can contribute to improving
the accuracy, especially on small and compact machines.
The ideal coordinate system is determined by the machine base (linear axes).
The angles are calculated based on this system. The viewing direction
depends on whether the rotary axis considered is a head axis or a table axis.
KinematicsOpt can perform a compensation to adjust the angular position of
the rotary axes. This is only possible in conjunction with software option 52
KinematicsComp, and if the kinematics model has been prepared
appropriately. This is done by changing the values of the rotation entries in the
COMPTAB column. The values are only changed if the field already contains a
numerical value (floating-point number). This prevents possible entries of a
component-error compensation through KinematicsComp from being
affected.
Angular-position compensations do not only influence the measured rotary
axis, but also the complete transformation chain. After the affected rotary axis
has been changed, KinematicsOpt therefore tries to undo the changes made
to angles, which is desirable in some cases. This is possible within the scope
determined by the correspondingly defined tolerances for the transformation
chain.
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