
B--63003EN--1/02
9. SPINDLE SPEED FUNCTION
869
CAUTION
(3)Although the system can change to rigid tapping mode
directly from Cs contouring contorl mode, positions
designated in Cs contouring control mode are not
preserve d if riged 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, nullify jogging and manual handling feed of
the Cs contouring axis in the PMC durin g 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.
When the spindle is an analog spindle, the loop gains of the spindle and
tapping axis are switched according to the values set in these
parameters.
When the spindle is a serial spindle, the loop gain of the tapping axis
is switched according to the values set in these parameters. The loop
gain of the spindle depends on the values set in the serial spindle
parameters and applied gear signals (CTH2, CTH1).
Accordingly, to perform rigid tapping with a serial spindle, the loop gain
for position control of the spindle must be set in the serial spindle
parameters used for rigid tapping.
When multi--spindle control is being used, rigid tapping can also be
performed for the second spindle. For the serial spindle used for rigid
tapping, set the parameters indicated below.
The parameters indicated below are the major serial spindle parameters
required for the setting and adjustment needed to use a serial spindle.
For details of the serial spindle parameters, refer to the “FANUC AC
Spindle Motor ∼ series DESCRIPTIONS (B--65152E) or FANUC AC
SPINDLE MOTOR α series PARAMETER MANUAL (B--65160E).
Position contro l loop
gain switching and serial
spindle parameters