
B-63783EN-1/01 11.PROGRAM COMMAND
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<4> If the current rotary axis angles are (B 180 degrees and C 90
degrees)
The output angles are (B 270 degrees, C 0 degrees)
Because both candidates are near the current position (180
degrees) of the B-axis, or the slave axis, to the same extent, the
candidate for which the C-axis, or the master axis, is near 0
degrees is employed.
To put another way, a set in which the C-axis and B-axis are,
respectively, at 0 and 270 degrees is employed.
If the slave axis is at 0 degrees, the direction of the tool axis is fixed in
a specific direction no matter at what angle the master axis is.
The master stays at the current angle.
Let us take the BC type tool axis Z-axis machine as an example.
BC type tool axis Z-axis
X
Y
Z
C
Fig.11.17 (l) BC type tool axis Z-axis
If the current rotary axis angles are (B 45 degrees and C 90 degrees)
The output angles are (B 0 degrees, C 90 degrees)