2,8.22 WORK COORDiNATE MULTI-SHIFT (G50T, G 51)T
(Cent’d)
T1 WHEN TOOL SLIDE IS
AT A GIVEN POSITION
(–\,
—:)
-x
I
,
M
+--T--- ‘--i
;T,
z,,
T
P, 1 VJHEN TOOL SLIDE IS
‘-~ AT POSITION (O, 0)
r,
.
~
/
X,l 2
c.
(3)
a.
b.
c.
WORK COORDINATE SYSTEM
Fig. 2.38
G50 TOOOO ;
By this command, the coordinate system is
set with the unit current position value.
This means that the canceling of the work
coordinate system setting is performed with
the content of tool coordinate memory = “ O“
and the content of tool offset memory = “ 0“
by the specification of TOOOO.
Return to current position origin (G 51)
By G51 ; command, tool is returned to the
point at rapid traverse rate where the unit
current position value is (O, O) , on both
X-axis and Z-axis.
With a part program that uses work
coordinate system setting, the machining
start point is the current position value
(O, O) in principle, Hence, the use of G51
command facilitates the return to the start
point (O, O) after completion of machining.
G51 command should always be specified on
a single block basis.
Notes :
1.
2.
3.
G 50 T and G51 are nonmodal G codes which
are valid only for the specified blocks.
When this function is used, set parameter
#6005D5to O (G50 preset of POS-EXTERNAL
display is off) .
G51 ; command is equivalent to the following
two block commands.
m
4.
5.
6.
When the G 50 T work coordinate system set-
ting is performed,
2.6.4,“ Work Coordinate
System Shift” is made valid.
The current position of the tool in the set
work coordinate system is shown in the cur–
rent position value
“POSITION ABSOLUTE. “
It is not shown in POSITION EXTERNAL.
The work coordinate system set by G 50 T
cannot be cancelled by a reset operation.
EXAMPLE A :
(The start point is current position display
(0, 0))
N1 G50 T51OO ;— Work coordinate system
setting for tool No. 01.
N2 GOO TO1O1 M03 s1OO ;
Selection of tool No. 01
(Note 1).
(Machining by tool No. 01)
N20Goox. ..z. ..; —
N21 G50 T5200 ; —
N22 GOO T0202 ; —
Positioning to a given
point.
Work coordinate sys-
tem setting for tool
No. 02.
Selection of tool
No. 02 (Note 1) .
(Machinig by tool No. 02)
N40 G51 ; —
Return to current position
display (O, O) .
Note 1: The tool position offset in TO1O1
and T0202 commands may be used for the
compensation for tool wear.
When specified
during machining, the tool position offset
may also be used for the compensation for
taper machining.
“ wCRK COORDINATE SYSTEM
MACHINING BY TOOL NO 01, 02
CAN BE PROGRAMMED ON THIS
COORDINATE SYSTEM
Consequently, after the execution of this
command, the tool offset number is cancelled
together with the work coordinate system,
setting the tool offset number to “ 00. “
64
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