
9.SPINDLE FUNCTION B-63323EN-1/03
- 840 -
5966 Drift compensation value (third stage)
)
3& <&
<) (> (>
Set the drift compensation value of the analog spindle for gear 3 in the servo mode
(rigid tapping, spindle positioning, and so forth).
Drift compensation DC (a voltage equivalent to positional deviation) is obtained
from the following equation:
G : Position gain in servo mode (0.01/sec)
GC : Position gain multiplier
ER : Positional deviation (detection unit)
ERGCGDC ×××= 000000192.0
5967 Position gain multiplier (fourth stage)
)
<) (4B=B
Set the position gain multiplier of the analog spindle for gear 4 in the servo mode
(rigid tapping, spindle positioning, and so forth).
Position gain multiplier GC is obtained from the following equation:
PLS : Number of pulses output from the position coder (pulses/rev)
SP : Number of gear teeth on the spindle side
PC : Number of gear teeth on the position coder side
E : Specified voltage (V) for turning the spindle motor at 1000 rpm
L : Angular displacement of the spindle (degrees) per spindle motor rotation
Example: For the spindle motor and gear ratio given below, GC is calculated as
follows:
PLS = 4096 pulses/rev
SP = 1
PC = 1
E = 2.2 V
L = 360 deg
Note)
On the assumption that the spindle motor used turns at 4500 rpm at 10 V, 2.2
V is required to turn the spindle motor at 1000 rpm.
LSPPLS
EPC
GC
××
×××
=
3602048000
1100
36014096
2.213602048000
=
××
×××
=GC