July 2013 6.5 Tilting and swivel axes 757
Then the C axis is measured and its angular position is optimized. The position
errors A0C and B0C are corrected through the compensations in lines 16 and
17. Because no further elements that make an inverse transformation of the
rotations possible are listed after the C axis, the workpiece coordinate system
remains rotated from the ideal system (machine base).
Example of AC head:
During measurements in mode 2, the angular errors B0A and C0A in lines 5
and 6 of the COMPTAB column are compensated. Inverse transformation of
the two angular errors B0A and C0A is not possible, because no corresponding
rotations are defined. This means that the tool coordinate system is rotated
from the ideal system. After the angular position has been adjusted, a
measurement is performed, in which the position of the rotary axis (Y0A and
Z0A) is determined. The position is corrected in lines 2 and 3.
NR DOC KEX AXIS COORD COMPTAB
0 ToolFile
1 ToolAxis Z
2 Y0A Trans Y +50.013
3 Z0A Trans Z +300.815
4 MachAxis A
5 B0A Trans B +0.0030
6 C0A Trans C -0.0009
7 X0C Trans X +0.053
8 Y0C Trans Y -0.092
9 -BOC Trans B +0.00337
10 -COC Trans C +0.0103
11 MachAxis C
12 C0A Trans C -0.0103
13 B0A Trans B -0.00337
14 MachAxis Z
15 MachAxis X
16 MachAxis Y
17 MachBase Ideal
coordinate
system
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