
B–63833EN–1/02
9. SPINDLE SPEED FUNCTION
591
CAUTION (continued)
3 When the Cs contouring control function for the serial
spindle is used together with the rigid tapping function, the
same motor is used for spindle rotation control, Cs
contouring control, and rigid tapping modes. The following
points must be noted:
(1)Whether to enter Cs contouring control mode or spindle
rotation control mode is selected by the CON (Cs
contouring control switch signal) signal; however, the
system can enter rigid tapping mode regardless of the
state of the CON signal. When the rigid tapping mode is
canceled the system enters spindle rotation control
mode or Cs contouring control mode according to the
state of the CON signal.
(2)Since the system can change to rigid tapping mode
directly from the Cs contouring control mode, use of the
Cs contouring control function enables the tapping tool
to be positioned before rigid tapping begins. Accurate
positioning is not guaranteed. If the rigid tapping cycle
executes gear change or output range changing,
positioning is valid.
(3)Although the system can change to rigid tapping mode
directly from Cs contouring control mode, positions
designated in Cs contouring control mode are not
preserved if rigid tapping mode is canceled by G80.
When the system is changed to rigid tapping mode from
Cs contouring control mode, then returns to the Cs
contouring control mode, G00 or G28 must be issued to
position the tapping tool.
(4)In systems with the serial spindle Cs contouring control
function, the spindle motor is in a state called servo mode
when it is operating in rigid tapping mode. In servo mode,
it can accept jogging and manual handling feed. To
prevent this, inhibit jogging and manual handling feed of
the Cs contouring axis in the PMC logic during rigid
tapping.
(5)The servo–off signal for the Cs contour control axis is
valid also for the spindle during rigid tapping. It should
be masked on the PMC side as required.
(6)When the multi–spindle control is also available and the
rigid tapping is performed on the 2nd spindle, the rigid
tapping can be specified to the 2nd spindle during the Cs
contouring control of the 1st spindle.
In rigid tapping, the loop gain of the tapping axis is switched so that the
loop gains for position control of the tapping axis and spindle match each
other.
This switching processing is specified by parameter Nos. 5280, and 5281
to 5284. The contents of the processing vary with whether the spindle is
an analog or serial spindle, as described below.
Position control loop
gain switching and serial
spindle parameters