B–64113EN–1/01
9. SPINDLE SPEED FUNCTION
540
With the spindle serial output or analog output function, specifying the
surface speed (m/min or feet/min) directly in an S command makes it
possible to change the spindle output continuously so as to maintain a
constant surface speed at a programmed point. (For the rapid traverse
command, however, the surface speed for the end point is output at the
beginning of rapid traverse.)
Spindle speed N
r
Surface speed S=2πr·N
Whether or not constant surface speed control is performed is selected by
G code.
G96: Constant surface speed control performed. S in the G96 mode is
m/min or feet/min.
G97: Constant surface speed control not performed. S in the G97 mode
is rev/min.
To perform constant surface speed control, the maximum spindle speed
for each gear select signal issued from the PMC side must be set by
parameter No. 3741-3744.
The gear select signal is a 2 bit code signal (GR1, GR2). The relationship
between the signal and gear number is :
GR1 GR2 Gear number
0 0 1
1 0 2
0 1 3
1 1 4
9.4
CONSTANT
SURFACE SPEED
CONTROL
General