Section 4 System Programming 59

Example:

 

 

G01

X1.0 Y3.0 Z-1.5 F12 Moves the tool directly to the Program

 

 

coordinate X=1.0, Y=3.0, Z=-1.5.

G52

X3 Y-7 Z0

Activates a local coordinate system with

 

 

origin at X=3, Y=-7, Z=0 relative to

 

 

Program Zero. The machine tool does not

 

 

move.

G01

X1.0 Y10.0 Z2.0

Moves the tool directly to the point X=1.0,

 

 

Y=10.0, Z=2.0 relative to the local

 

 

coordinate system as defined by the G52

 

 

command above.

G52

X0 Y0 Z0

Cancels use of the local coordinate system.

 

 

All absolute moves are again relative to

 

 

Program Zero as you set it before running

 

 

the program.

G90 Absolute Positioning Mode

The G90 command puts the system into absolute positioning mode. All XYZ coordinates are treated as points relative to Program Zero (or a local coordinate system set by the G52 command). This command stays in effect until a G91 command occurs.

Note that absolute positioning is the default positioning mode for LC. It is not necessary to include this command in your G-code file if all your moves are absolute.

G91 Incremental Positioning Mode

The G91 command puts the system into incremental positioning mode. All XYZ coordinates are treated as incremental move distances. This command stays in effect until a G90 command occurs.

Example:

 

 

G01

X1.0 Y3.0 Z-1.5 F12 Moves the tool directly to the Program

 

 

coordinate X=1.0, Y=3.0, Z=-1.5. G90 is

 

 

assumed.

G91

 

All XYZ coordinates after this command

 

 

will be interpreted as incremental distances.

G01

X1.0 Y2.0 Z-0.5

Moves the tool a distance of X=1.0, Y=2.0,

 

 

Z=-0.5 from the current tool location. This

 

 

corresponds to the Program coordinate

 

 

X=2.0, Y=5.0 Z=-2.0.

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Image 63
Anaheim DPJ72LC3, DPJ72LC2, DPJ72LC4 manual G90 Absolute Positioning Mode, G91 Incremental Positioning Mode