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14. Coordinates System Setting Functions
14.8 2nd, 3rd and 4th Reference (Zero) Position Return; G30
516
Detailed description
(1) The second, third, or fourth reference (zero) position return is specified by P2, P3, or P4. A
command without P or with P0, P1, P5 or a greater P number is ignored, returning the tool to
the second reference (zero) position.
(2) In the second, third, or fourth reference (zero) position return mode, as in the first reference
(zero) position return mode, the tool returns to the second, third, or fourth reference (zero)
position via the intermediate point specified by G30.
(3) The second, third, and fourth reference (zero) positions coordinates refer to the positions
specific to the machine, and these can be checked with the setting and display unit.
(4) If G29 is specified after completion of returning to the second, third, and fourth reference (zero)
positions, the intermediate position used last is used as the intermediate position for returning
by G29.
Intermediate point (x
1
,y
1
)
1st reference (zero)
position
3rd reference (zero) position
R#3
(x
2
,y
2
)
G29Xx
2
Yy
2
;
R#1
G30P3Xx
1
Yy
1
;
-X
-Y
(5) With reference (zero) position return on a plane during compensation, the tool moves without
tool radius compensation from the intermediate point.
With a subsequent G29 command, the tool moves with tool radius compensation until the G29
command from the intermediate point.
Tool nose center
path
Programmed path
Intermediate point
3rd reference (zero) position
R#3
(x
2
,y
2
)
G29Xx
2
Yy
2
;
(x
1
,y
1
)
-Y
-X
G30P3Xx
1
Yy
1
;