Yaskawa J50M Instructions User Manual

Page 43

When G29 is programmed, it is not necessary to
consider the distance between point B and C in the

program. Particularly when an incremental command
is used, this is effective for returning tool to the
original position, after returning to reference zero.

Movement of C

B and of B

D is made at rapid

traverse rate simultaneously along three axes
(simultaneously four axes t) by G29. However, in an
axis for which a coordinate command was omitted,
the tool will not move.

If G28 is programmed a number of times, the

coordinates of point B which the last G28

creates is effective for the move of G29.

EXAMPLE 1 (In the case of absolute input)

Interim point

N21 G90 ;

coordinates

N22 G28 Z1O.

Y20.

(o, 20.

, 10. )

N23 G28 X30. ;

( 30.

, 10

)

blocks

EXAMPLE 2

N31

;

N32 G28

N33 G28 X20.

Y40.

N34 M06 ;

N35 G29 X40.

Y-40.

(REFERENCE POINT)

Fig. 2.29

Notes :

. An input error

if G29 is program-

med in tool ‘radius compensation mode ( G41,

G42) or during canned cycle mode

G76, G77, G81

G89) .

An input error

is given

without execution of G28 after the control is
turned on.

In principle, cancel tool offset before program-
ming G28 or G29.

If they are programmed when

offset is also effective. interim positioning
point B will also be offset, and the tool passes

point B’ .

(REFERENCE POINT)

OFFSET

-----

(INTERIM POSITIONING

POINT)

A’

Fig. 2.30

An input error “058” occurs if G29 is given dur-
ing mirror image

The

command or operation must not

be taken

interim positioning point B of

G28 does not meet with that of G29.

(1) The following operations are made between

G28 and G29 commands.

Setup of coordinate system (G92, ORG key)

. Machine lock

Manual operation at Manual Absolute Off

(2) G28 and G29 are commanded in the blocks

following the block containing M94 which
cancels mirror image at the different point
from the starting point of mirror image.

(3) G28 and G29 are commanded after manual

operation at Manual Absolute Off.

2.9.17 RETURN TO 2ND, 3RD AND 4TH REFERENCE
POINT

G30

(a t...) ;

(where Pn = P2, p3, p4)

With this command, the tool first moves to an in-

terim positioning point, and then, moves to the

2nd, 3rd or 4th reference point.

P2:

2nd reference point

}

When P is omitted,

P3:

3rd reference point

the tool moves to

P4:

reference point

the 2nd reference

point.

If any axis of the coordinate instruction is omitted,
the tool remains motionless in the direction of that
axis.

Each reference point is specified by the
eters (#6612 to #6629) before hand.