
B–63173EN–1/01
9. SPINDLE SPEED FUNCTION
359
If the gear ratio is either 1:1, 1:2, 1:4, and 1:8, it is set using parameters
PG1 and PG2 (No. 3706 #0, #1). This applies if the position coder is
mounted in a spindle or built into a spindle motor when only one stage
gear is provided. .
Parameter Gear ratio
PG2 PG1 Spindle Position coder
u
0 0 1 1 360/4096=0.08789 deg
0 1 1 2 360/4096 2=0.17578
deg
1 0 1 4 360/4096 4=0.35156
deg
1 1 1 8 360/4096 8=0.70313
deg
The spindle motor building in the 512 pulses/rev position coder uses the
values set forth in the following table. A serial spindle does not require
double-value setting; use the same values as for the spindle motor
building in the 1024 pulses/rev position coder.
Gear ratio Parameter
Gear ratio
Detection
Built–in
position
Spindle
motor
Spindle PG2 PG1
to position
coder
unit
(deg)
coder
1 1 0 1 1:2 0.17578
2 1 1 0 1:4 0.35156
4 1 1 0 1:8 0.70313
If the M type gear selection method is selected, the CNC determines
whether gears need changing using the gear change specification
mentioned in section 9.3. If the gears need to be changed, the CNC
generates the S function code read signal SF (F007#2) and gear selection
signals GR10, GR20, and GR30 (F034#0-#2) to notify the PMC. Change
gears using the PMC, based on these signals.
If the T type gear selection method is selected, the CNC does not process
gear changes. When the CNC has the S function code, it outputs signal
SF and S function code signals S00 to S31 (F022#0-F025#7) to the PMC.
(However, parameter No. 3705 and its related parameters need to be set
for S code and SF signal output). Using the PMC, determine whether
gears need changing, and make the change if needed. Input gear selection
signals GR1 and GR2 <G028#1,#2> for the selected gear, and notify the
CNC of them.
To perform rigid tapping with the serial spindle, enter the clutch/gear
selection signals CTH1 and CTH2 (G070#3,#2) from the PMC. Notify
the serial spindle control unit of these signals via the CNC, irrespective
of the gear selection method.
S Gear ratio is 1:1, 1:2, 1:4,
1:8 (VGR=0)
(3) Rigid tapping and
machines with
multiple gears