
B–63503EN–1/01
9. SPINDLE SPEED FUNCTION
387
Assume that gear switching is two stage switching. If the spindle speed
with the output 10 V is 1000 min
–1
for the low speed gear (G1) and 2000
min
–1
for the high speed gear (G2), set these speeds to the parameter No.
3741, 3742, respectively. In this case, the spindle output has the linear
relationship shown below:
When gear
2 selected
When gear
1 selected
(Volt)
0
V
2
V
1
10
600min
–1
1000min
–1
2000min
–1
N
G2
G1
Spindle output
Here, S = 60 m/min is given as the surface speed; if the position of the
present X-axis cutter is 16 mm from the center, the spindle speed N
becomes 600 min
–1
(S = 2πr N). Therefore, V
1
(for G1) or V
2
(for G2)
is calculated inside the CNC and output to the machine side.
V1: 6(V)
V2: 3(V)
The value of output voltage V is calculated automatically from the
following equations:
(i) G96
V=
10S
2πrR
R: Spindle speed (min
–1
) at 10V output voltage (that is , spindle speed set
by parameter No. 3741 to No. 3744)
S: Surface speed (m/min) specified by S command
r: Radius value in the X-axis direction (m)
(ii)G97
V=
10N
R
R: Spindle speed at 10V output voltage (min
–1
)
N: Spindle speed given by S command (min
–1
)
Example of Spindle
Analog Output