
11.SPINDLE SPEED FUNCTION B-63943EN-1/02
- 1258 -
- Example of Spindle Analog Output
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
0
V
2
V
1
10
600min
-1
1000min
-1
2000min
-1
N
G2
G1
Spindle output
(Volt)
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
1
(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
)