686 HEIDENHAIN Technical Manual iTNC 530 HSCI
The following number of transformation entries results for a five-axis machine:
Per linear axis: 10 entries in COMPTAB
Per rotary axis: 10 entries in COMPTAB, 2 entries in COORD
Total 5 x 10 = 50 in COMPTAB, 2 x 2 = 4 entries in COORD
All position and component errors of the axes of a five-axis machine tool (three
linear and two rotary axes) can be described separately with 50 transformation
entries. This means that the compensation of one axis has no effect on the
other axes. The positioning errors (e.g. EXX, ECC) are corrected as usual in
columns 1-18 of the COM files, the offsets are corrected in machine
parameter MP960.
When determining only position errors, the size of the transformation chain is
reduced:
Per linear axis: 4 entries in COMPTAB
Per rotary axis: 4 entries in COMPTAB, 2 entries in COORD
Total 5 x 4 = 20 in COMPTAB, 2 x 2 = 4 entries in COORD
The isolated description is absolutely necessary if information about other
axes is missing. If information about other axes is available, inverse
transformations might be omitted or combined with the transformations of the
subsequent axes.
The limitation of a maximum of 50 transformation entries (Trans and MachAxis)
currently applies for the total description of the actual machine kinematics.
For error compensation with KinematicsComp, a maximum of 100 additional
entries in the column COMPTAB is allowed. However, all MachAxis entries of the
kinematics description must first be subtracted from the maximum of 100
entries, because the MachAxis entries are included in the calculation of the
compensation (e.g. if five MachAxis entries exist, only 95 entries remain for
use in the COMPTAB columns).
No more than 50 of these entries are allowed in the COORD column.
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