Model SH-2012AH-QG
Cutting Machine
（
C002
）
19
6.3. 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
G20 stands for English system. Following G20, the values of X
，
Y
，
I
，
J
，
R
，
U
，
V
，
H and F are all in English
unit
；
G21 stands for metric system. Following G21, the values of X
，
Y
，
I
，
J
，
R
，
U
，
V
，
H and F are all in metric
unit
；
Format: G20
Format: G21
+Y
+280
＋
120
＋Ｘ
Current Torch Position
Expected Torch Position
E.g.：G92 X0 Y0
G00 X120 Y280
(or G00 U120 V280)
M02
www.collectcnc.com
