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11.3. G: Basic Preparatory Commands
1
）
G92: Reference Point Setting Command
When developing a program, it is required to place the coordinate value(absolute coordinate) of machining
origin point(reference point) at the very beginning.
Format: G92 Xn Yn
If G92 is not followed with X/Y coordinate values, then the current X/Y coordinate will be taken as reference
point. Generally, when the origin point of machine is used as
reference point
for positioning purpose, G92 will
not be followed with X/Z values.
2
）
G90/G91: Absolute/Relative Coordinate Commands
When using G90, X/Y represent coordinate values and U/V represent the values relative to
the current point; when using G91, X/Y and U/V all represent the values relative to the
current point.
Format: G90
Format: G91
Exemple 1:
G92 X0 Y0
G91 // Relative coordinate system
G00 X100 Y100 // Quickly reach point(100, 100), equivalent to
G00/U100/V100
G01 X500 Y100 // Machining to point(600,200) along a straight line,
equivalent G01/U500/V100
Exemple 2:
G92 X0 Y0
G90 // Absolute coordinate system, by default
G00 X100 Y100 // Quickly reach point(100, 100)
G01 X600 Y200 // Machining to point(600,200) along a straight line
3
）
G20/G21: English/Metric Commands
+X
+Y
O
Fig. 6.1 Rectangular coordinate
