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new code has G92 instruction, the coordinate of this reference point is the context after G92, if
no G92, the reference point is default (0, 0). In one code file, G92 only appears once.
Example:
a.
G92 X0 Y0
Take (0,0) as reference coordinate, when press “go back” function key, the machine tool
goes back to coordinate point (0, 0).
b.
G92 X20 Y0
Take (20,0) as reference coordinate, when press “go back” function key, the machine tool
goes back to coordinate point (20,0).
2.
G90/G91
Format:
G90/G91
G90: absolute coordinate. X/Y in the code means absolute coordinate value; U and V mean
relative coordinate value.
G91: relative coordinate. X/Y in the code means relative coordinate value; U and V also
mean relative coordinate value.
Example
：
a.
G90 usage
G92 X0 Y0 // Reference point (0,0)
G90 // Absolute coordinate
G00 X20 Y0 // Rapidly moving tool to (20,0)
M07 // Cutting device on
G01 X120 Y100 //Cutting to (120,100)
M08 //Cutting device off
M02 // End of program
(20
，
0)
(120
，
100)
Fig 10.2 G90 usage
b.
G91 usage
G92 X0 Y0 // Reference point (0,0)
G91 // Relative coordinate
G00 X20 Y0 //Rapidly moving gun to (20,0)
M07 //Cutting device on
G01 X120 Y100 //Cutting to(140,100)
M08 //Cutting device off
M02 // End of program
(20
，
0)
(140
，
100)
Fig 10.3 G91 usage
