
B–63523EN–1/03
9. SPINDLE SPEED FUNCTION
1194
CAUTION
1 When using an analog spindle, set the spindle speed offset
value parameter (No. 3731) accurately. For the standard
system, a value within –8191 to 8191 must be specified in
this parameter. To perform rigid tapping, a value within
–1023 to 1023 must be specified.
If the spindle speed offset is set inaccurately, the spindle is
stopped and placed in in–position wait state when tapping
is started.
In rigid tapping with a serial spindle, no setting is required
for parameter No. 3731. Be sure to set 0.
2 When the threading and synchronous feed functions are
enabled, the actual spindle speed during rigid tapping is
indicated correctly. When an arbitrary gear ratio is used (by
setting bit 1 (VGR) of parameter No. 5200 to 1), however,
the actual spindle speed will not be indicated correctly in
normal spindle mode.
When the T series is used, for example, information about
the actual spindle speed is important for lathe machining.
So, be particularly careful when using an arbitrary gear
between the spindle and position coder.
NOTE
1 A spindle pitch error is not compensated for in rigid tapping
mode. Drift compensation is not made with an analog
spindle.
2 The maximum number of pulses that can be distributed to
the spindle is:
⋅ 32,767 pulses per 8 msec for a serial spindle
⋅ 4,096 pulses per 8 msec for an analog spindle
(This information is displayed by selecting No. 451 on the
diagnosis screen.)
These values vary with the position coder gear ratio setting
and rigid tapping specification. If a value greater than the
maximum allowable number is specified, P/S alarm No. 202
is issued.
9.11.10
Notes
NOTES ON SPINDLES