# PDF Fanuc Power Mate i-D/H Parameter Manual

4. DESCRIPTION OF PARAMETERS
B63180EN/02
136
Spindle
Motor
Spindle
Position
coder
1 : 1 : 2
P. C
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 rpm corresponds to 10 V.)
L = 360_ (One rotation of the spindle corresponds to one
rotation of the spindle motor.)
α = La/4096
= 720_/4096
= 0.17578
La = 720_ (= 360_ 2. One rotation of the position coder
corresponds to two rotations of the spindle.)
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. . . . . . .
According to above ratio the loop gain multiplier is calculated as
2048 1.667/360 0.17578 1000 = 1667
* When the position coder which is built in a spindle motor sends
512 pulses per rotation, the unit used for the detection, α, is
La/2048.
Fig.4.20 (b) Connection among the spindle motor, spindle, and position coder
5300
Tapping axis inposition width in rigid tapping
5301
Spindle inposition width in rigid tapping
[Data type] Word
[Unit of data] Detection unit
[Valid data range] 0 to 32767
These parameters are used to set tapping axis and spindle inposition
widths in rigid tapping.
NOTE
If an excessively large value is specified, the threading
precision will deteriorate.
5310
Positional deviation limit imposed during tapping axis movement in rigid tapping
[Data type] Word
[Unit of data] Detection unit
[Valid data range] 1 to 32767
This parameter is used to set a positional deviation limit during tapping
axis movement in rigid tapping. A value that falls outside the valid data
range, described above, can be specified in parameter No.5314.
Examples