
9. SPINDLE SPEED FUNCTIONS
B–64112EN/01
NC FUNCTION
90
The serial interface spindle permits positioning and linear interpolation
with another servo axis. Thus, linear interpolation between the spindle
and a servo axis can be specified.
The serial interface spindle has two modes.
- The spindle rotation control mode controls the speed of the spindle.
(The spindle is rotated according to a speed command.)
- The spindle contour control mode (also called Cs contour control)
controls the position of the spindle. (The spindle is rotated according
to a move command.)
These modes are switched by a signal sent from the PMC.
The axis subject to spindle contour control is placed as one of the CNC
control axes. Any of the control axes can be selected as the spindle contour
control axis.
In manual and automatic operation, a move command for the spindle
contour control axis is programmed in the same way as for a servo axis.
Example) Let the name of the spindle contour control axis be C.
G00 C30.0 ; (Positioning)
G01 X100.0 Y100.0 C90.0 F1000.0 ; (Linear interpolation)
- Switching from spindle rotation control to spindle contour control
If there is a difference in servo loop gain between the axis subject to
spindle contour control and the other servo axes, linear interpolation
with the spindle contour control axis cannot be performed properly.
As soon as spindle rotation control is switched to spindle contour
control, an appropriate spindle contour control servo loop gain for a
selected gear is automatically set for a necessary servo axis. The axis
for which the servo loop gain is to be changed, and the spindle contour
control servo loop gain for this axis must be set in parameters for each
gear beforehand.
- Switching from spindle contour control to spindle rotation control
As soon as spindle contour control is switched to spindle rotation
control, the original servo loop gain is set for the servo axis
automatically.
9.10
Cs CONTOUR
CONTROL
Explanations
D Control mode
D Spindle contour control
axis
D Move command
D Automatic loop gain
setting when switching
between spindle rotation
control and spindle
contour control is made