Return Reference (G28/G281/G282/G283/G284/G285/M800/ M881) - Shenzhen Guanhong Automation SZGH-CNC990TDb series User Manual

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Format: G25
For example:
(21) Return Reference
Reference point is a particular position point in machine.If there is machine zero point,it is
reference point, otherwise,set float zero point and take it as reference point.it could return
reference point in Manual or in Auto.
Return Reference instruction means tool go to reference point according to appointed axis
automatically.
Format: G28 X/U_Y(C)/V_Z/W_A_B_;ZXY return to reference
Attention:when C axis return reference point,the system only detect the Y0 signal,not detect Z0 signal.
M800 C axis return zero point of encoder(Z0),when C is as rotation axis,output M75 signal,
the spindle servo select position control mode,when system run M03/M04,turn off M75 signal.
M881 C axis exact stop,send out Y31 signal,wait for answer signal X40,when X40 is in
position,and then cancel Y31 signal.
G28 X/U_ Y(C)/V_ Z/W_A_B_; the coordinate value is middle point when return.
The steps is as follow picture:B pint is middle point,R point is reference point.
(1)quickly move from current position(A point) to middle point (B point)
(2)quickly move from middle point(B point) to reference point(R point)
Program:
Or
78
;Save current coordinate
G61、G611、G612、G613、G614、G615; XZ, X,Y,Z,A,B
N0000 G0 X20 Z80
N0001 G01 U5 W－16 F200
N0002 W－100
N0003 G00 U10
N0004 Z80
N0005 G25
N0006 G01 U10 W-30 ；
N0007 G0 X100 Z200 ；
N0008 G61
N0009 M2
(G28/G281/G282/G283/G284/G285/M800/ M881)
G281 ;only X return to reference
G282 ;only Y return to reference,
G283 ;only Z return to reference
G284 ;only A return to reference
G285 ;only B return to reference
G28 X50 Z-20 ;
G28 U20 W0;
SZGH-CNC990TDb(c) Series
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