
B-65150E/04 4. SERVO FUNCTION DETAILS
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(6) Cautions for combined use of fine acceleration/deceleration and rigid
tapping
(a) Overview
Because using fine acceleration/deceleration causes the servo axis
delay (error) to increase by 1 ms, rigid tapping with fine
acceleration/deceleration set up results in an increase of
synchronization error against the spindle. To avoid this increase,
use the following procedure to change the servo axis position gain
for rigid tapping.
(b) Setup procedure
For the Series 16, 18, and 21, use either of the following two
methods (A and B); do not perform both at a time.
For the Series 15-B and 15i, it is impossible to specify different
rigid tapping position gains between the servo axis and spindle.
Therefore, only method B can be used for the Series 15-B and 15i.
A. Method for changing the rigid tapping servo position
loop gain
The Series 16, 18, and 21 have the following two different
parameter types for position gain setting.
a. Nos. 4065 to 4068: Spindle servo mode position gain
b. Nos. 5280 to 5284: Rigid tapping position loop gain
Parameter type "a" corresponds to the spindle position loop
gain for rigid tapping, and parameter type b, to the servo axis
position loop gain. Usually, both parameter types take the
same values. For a servo axis with fine
acceleration/deceleration specified, however, set parameter
type b with the values obtained using the following
calculation:
100000
= ×
100000 − Usually set position
gain value
NOTE
In advanced preview control mode, rigid tapping
cannot be used together with fine acceleration/
deceleration. In this case, disable fine acceleration/
deceleration.
Newly set
position gain
value
Usually set
position gain
value