2.8.27 CONSTANT SURFACE SPEED CONTROL
(G 96, G 97)+ ( Cent’d )
c.
10 ‘h’
OR
4095
d.
Note:
#6020DI
and #6020D7 are independ-
ent from each other.
#6020D7 = “o” . . .
The position obtained
by adding the tool position offset amount
and the tool nose radius compensation
amount is shown in the current position
display “POSITION ABSOLUTE. “
#6020D7 = “l” . . .
The position obtained
by
not adding the tool position offset
amount is shown in the current position
display “POSITION ABSOLUTE. “
Thus , the switching of the computation
for constant surface speed control and
the switching of the computation for cur–
rent position display on CRT are perform-
ed separately.
The spindle gear may be changed in the
maximum of 4 steps .
The parameters for
the gear change are as shown below. For
details, see the Parameter List.
COMMAND TO
SPINDLE MOTOR
4 T 4
SPINDLE SPEED
,-, ..
Fig. 2.66
When parameter #6020D0 = “ 1, “ the constant
surface speed control is performed on all
positioning blocks ( GOO, G06) also. For
positioning , however, the constant surface
speed is computed for the end coordinate of
the positioning block. The constant sur-
face speed is at every moment computed for
only the cutting block .
Jvhen #D6020D0 = “O, “ the constant surface
speed control is performed only on the cut–
ting block and the positioning block immedi-
ately before it.
For the positioning block,
the constant surface speed is computed for
its end coordinate.
(; 00/
“Y
THIS PROVIDES END
/
POINT SURFACE SPEED
/
/
AT START OF GOO
O@-/
AT THE TIME OF GOO
.4
CONSTANT SURFACE
SPEED IS COMPUTED
~
x,
FOR THIS
Fig. 2.67
EXAMPLE: #6020 = O
N4 G50 S1500 ;+
Upper limit of spindle
s~eed clam~ (in r/rnin)
.
1 .,.
1N5 MAA ;
M code for gear change
N6 G96 s150 M03 ;
7
Constant surface
N7 GOO X40. 25. ;
speed 150 m/min
)
N8 GO1 20 FO.15 ;
I
N9 x80. 2-30. ;
Nlo w-lo. ;
t
Constant
surface
speed control
Nll G22 X120. W-20. R20. ;
N12 GO1 U1O. ;
J
N13 G97 S500
; -~ Cancel of constant
N14 G50 S2000 ;
L
surface speed
control
+x
5.
!
120.
DIA
20.10. 30
+Z
2.8.28 FEED/MINUTE AND FEED/REVOLUTION
SWITCHOVER
These G codes are used to switch between the
designation of feed per minute and the designa-
tion of feed per revolution, before specifying
F(E) code (feed) command.
(1) G98 ;
By
this command, the F(E) code specified
after is executed on a feed per minute basis .
G 98
I
Meaning
‘e”iCd-— -–
mmlmin designation
Inch input
I
inlmin designation
124
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