上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
Specialized, Concentrated, Focused 9
Modal G function: a group of G functions that can be cancelled mutually; a G function remains in
effect until another G function in the same group appears to cancel it.
Commands Related to Coordinate System and Coordinates
G90 Absolute Programming and G91 Incremental Programming
Command Format: G90/G91
Description:
G90: it denotes absolute programming; the programming value on each programming coordinate
axis is with respect to the origin of current WCS.
G91: it denotes incremental programming; the programming value on each programming
coordinate axis is with respect to the previous position, and the value equals the distance that the tool
moves in each axis.
G90, as the default, and G91 are modal functions and can be mutually cancelled. They cannot be
used in the same program block. For example, G90 G91 G0 X10 is unallowable.
Programming Example:
As shown in Fig. 4-1 below, programming with G90, G91: the tool moves in sequence from origin
to point 1, 2, and 3.
20
60
40
Y
X
O
15
25
45
1
2
3
N X Y
N01 X20 Y15
N02 X40 Y45
N03 X60 Y25
N X Y
N01 X20 Y15
N02 X20 Y30
N03 X20 Y-20
G90 programming G91 programming
Fig. 4-1 G90/G91 Programming
Selecting the right mode can simplify the programming. If the drawing dimension is given based
on a fixed datum, it is better to adopt absolute programming mode; if the drawing dimension is given
on the basis of space distance between contour apexes, it is better to adopt incremental programming
mode.
G92 Set WCS according to Tool Position
Command Format: G92 X_Y_Z_
Description:
X_Y_Z_: the directed distance between origin of WCS and the beginning point of tool, i.e. the
workpiece coordinates of the beginning point of current tool
A program is compiled based on WCS and begins with the cutter beginning point; before
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