
21.5-AXIS MACHINING FUNCTION PROGRAMMING B-63944EN/02
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<4> When the current rotary axis angles are (B 180 degrees; C 90
degrees)
The "output angles" are (B 270 degrees; C 0 degree).
Since the two candidates are equally near to the current
position (90 degrees) of the C-axis that is the master axis, a
judgment is made based on the current position of the B-axis.
In this case, however, the two candidates are also equally
near to the current position of the B-axis (180 degrees).
Therefore, the candidate is adopted in which the C-axis
(master axis) is nearer to 0 degree.
That is, the pair is adopted whose C axis angle is 0 degree
and whose B axis angle is 270 degrees.
When the slave axis angle is 0 degree, the direction of the tool axis
becomes fixed regardless of the master axis angle.
In that case, the master axis does not move from the current angle.
An explanation is shown below using a machine having a "BC type
tool axis Z" as an example.
X
Y
Z
C
Fig. 21.1 (i) BC type tool axis Z
When the current rotary axis angles are (B 45 degrees; C 90 degrees),
the "output angles" are (B 0 degree; C 90 degrees).