
B–63503EN–1/01
9. SPINDLE SPEED FUNCTION
496
Example)
SPINDLE
MOTOR
Spindle
Position
coder
1: 1: 2
When the spindle motor, spindle, and position coder are
connected as shown left, let the variables be as follows:
E = 1.667 (V)
(A motor speed of 6000 min
–1
corresponds to 10
V. )
L = 360°
(One rotation of the spindle corresponds to one
rotation of the spindle motor.)
a = La/4096
= 720°/4096
= 0.17578
La = 720°
(One rotation of the position coder corresponds
to two rotations of the spindle = 360° 2.)
4096 = The number of detected pulses per
rotation of the position coder
Gear ratio between the spindle and the position coder
1:1 0.08789 degrees. . . . . . . . . . .
1:2 0.17578 degrees. . . . . . . . . . .
1:4 0.35156 degrees. . . . . . . . . . .
1:8 0.70313 degrees. . . . . . . . . . .
Thus, Loop gain multiplier
= 2048 1.667/360 0.17578 1000 = 1667
NOTE
When the position coder which is built in a spindle motor
sends 512 pulses per rotation, the unit used for the
detection, a, is La/2048.
5300 In–position width of tapping axis in rigid tapping
[Data type] Word
[Unit of data] Detection unit
[Valid data range] 1 to 32767
This parameter sets the in–position width of a tapping axis in rigid
tapping.
5301 In–position width of spindle in rigid tapping
[Data type] Word
[Unit of data] Detection unit
[Valid data range] 0 to 32767
This parameter sets the in–position width of a spindle in rigid tapping.