
21. AXES CONTROL
B–63832EN/01
NC FUNCTION
212
G51.2 P_ Q_ ;
P and Q : Rotation ratio of spindle to B axis
Command range : Integer value of 1 to 9 for both P and Q
When the value of Q is positive, the rotation direction of B
axis is in positive direction.
When the value of Q is negative, the rotation direction of B
axis is in negative direction.
(Example) When the rotation ratio of spindle to B axis is equal to 1 : 2
and the rotation direction of B axis is positive direction
G51.2 P1 Q2 ;
G50.2 ;
Cancel
When synchronous start is commanded by the G51.2, one rotation signal
from the position coder mounted in the spindle is detected and the rotation
of B axis is controlled while being synchronous with the rate of spindle
in response to the rotation ratio (P : Q). Namely, control is made so that
the ratio of spindle to B axis is P : Q. This relationship continues until
the synchronous cancellation command (G50.2 or reset) are carried out.
The direction of rotation of B axis is determined by the symbol Q and is
not affected by the direction of rotation of position coder.
When the G50.2 is commanded, the synchronization of the spindle and
B axis is canceled and the B axis is stopped.
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