
A-79348E
Title
Draw
No.
32/88
page
FANUC Series 30i-MODEL A
Tool center point control
for 5-axis machining
Ed. Date Design Description
Date Jan.16.’04 Design. Apprv.
<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. 1.1 (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).