Position Commands; Position Command Methods ; G90, G91 - Mitsubishi Electric MELDAS C6 Programming Manual

5. Position Commands

5. Position Commands

5.1 Position command methods ; G90, G91

Function and purpose
By using the G90 and G91 commands, it is possible to execute the next coordinate commands
using absolute values or incremental values.
The R-designated circle radius and the center of the circle determined by I, J, K are always
incremental value commands.
Command format
G90(G91) Xx1 Yy1 Zz1 αα1
G90
G91
α
Detailed description
(1) Regardless of the current position, in the absolute
value mode, it is possible to move to the position of the
workpiece coordinate system that was designated in
the program.
N 1 G90 G00 X0 Y0 ;
In the incremental value mode, the current position is
the start point (0), and the movement is made only the
value determined by the program, and is expressed as
an incremental value.
N 2 G90 G01 X200. Y50. F100;
N 2 G91 G01 X200. Y50. F100;
Using the command from the 0 point in the workpiece coordinate system, it becomes the same
coordinate command value in either the absolute value mode or the incremental value mode.
(2) For the next block, the last G90/G91 command that
was given becomes the modal.
(G90)
(G91)
:Absolute value command
:Incremental command
:Additional axis
N 3 X100. Y100.;
The axis moves to the workpiece
coordinate system X = 100mm and
Y = 100mm position.
N 3 X–100. Y50.;
The X axis moves to -100.mm and the Y axis to +50.0mm as an incremental
value, and as a result X moves to 100.mm and Y to 100.mm.
18
5.1 Position command methods
Y
200.
100. N1
W
Y
200.
100.
W
Tool
N2
X
100. 200. 300.
N3
X
100. 200.
300.