2.8.19.4 The G40
Cancel Function is
Nose R Function
The G40 GOO X
GOIXZIK
; Command
Also Available in the Automatic
ZIK : command cancel
function (menti=ned~at=) , ~s” well as the same
function by the GO I command are available.
This makes a projected wall by the I, K
commands in the block before the G40 GO1
command, to execute the nose R calculation.
Notes :
1.
2.
3.
4.
5.
The nose R center is
end point in the G40
G40 single-block.
The nose R complete
the block immediately
block or G28 block,
on the normal of the
GOO X Z
; block or
— —
cancel is performed in
before the G51 single-
The cross point is calculated in the block
immediately before G40 GOO X Z I K ;
and the vector indicated by ‘~, ‘K. ‘r —
When GO1 and G41 (G42) are commanded at
the same time, the nose R center will be on
the normal of the start point of the next
block .
However, in canned cycle, start up can
be performed by GO1 G42 of the firstblock,
but cannot be performed by repeating the
command later.
G40 GO1 X K
; and G40 GO1 Z I ; are
of the sam~com—mand format as th~ ch>mferin g
command, but the cancel function has priority
only when the G40 command is given.
2.8.20 PROGRAMMING OF ABSOLUTE ZERO POINT
(G 50)
Absolute coordinate system should be set before
move command.
After setting up the absolute
coordinate system,
all motions can be commanded
on the absolute coordinate system.
(1) G50 X.. . Z.. . ;
x
.—
2
ABSOLUTE ZERO
POINT (O, O)
d
(2)
Fig. 2.34
G50 U.. . W.. .
; (Incremental G50 )
+Z
When the addresses U and W are specified
instead of X and Z, the new absolute coor-
dinate is set up by adding incremental
values U (X-axis) and W ( Z-axis) to the
absolute coordinate previously set.
When the tools are very cliff erent in length,
the incremental G 50 (addresses U, W) is
use f ul. The tools should be divided into two
groups.
Then, the difference between the
length of the reference tool and that of the
second group of tools can be set at the
incremental G 50 command and an absolute
coordinate system can be stored.
G50 U1OO.
W-1OO. ; . . . Setting of
Position B
G50 COMMAND FOSITION
+x
100.
I
H
OF REFERENCE TOOL
B
50 /(G50x z ‘)
FOSITION OF
THE SECONO
y
GROUP
+------+’
Fig. 2.35
This command makes the present position of
tool tip the absolute coordinates (X, Z ) .
The values with a sign following the address-
es X and Z are the distances between tool
tip and the absolute zero point (O, O) to be
set.
Therefore, it can be said that “G50
command specifies the absolute zero point. ”
61
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