9 Coordinate Systems, Plane Selection
will create a local coordinate system.
–If coordinate v is specified as an absolute value, the origin of the local coordinate system will coincide with the point v in the work coordinate system.
–When specified as an incremental value, the origin of the local coordinate system will be shifted with v offset (provided a local coordinate system has been defined previously, or else the offset is produced with respect to the origin of the work coordinate system).
Henceforth any movement command specified in absolute coordinates will be executed in the new coordinate system. The positions are also displayed in the new coordinate system. The values of coordinates v will be treated invariably as Cartesian coordinates.
If, e.g., the tool is at point X=150, Y=100 coordinates in the current X, Y work coordinate system, instruction
G90 G52 X60 Y40
will create a new local X', Y' coordinate system, in which the coordinates of tool will be X'=90, Y'=60. Instruction G52 is used for defining the axial components of offset vector v' between the X, Y and X', Y' coordinate systems (v'x=60, v'y=40).
Now one of two different procedures may be adopted in order to transfer the local coordinate system to the point of X", Y" position.
–With an absolute data specification: instruction (G90) G52 X30 Y60 will move the origin of the X", Y" coordinate system to point X=30, Y=60 in the X,Y work coordinate system. The components of vector v" will be produced by the specification of v"x=30, v"y=60.
–With an incremental data specification: instruction G91 G52
system. The components of vector v will be produced by the specification of
The tool position in the X", Y" coordinate system will be X"=90, Y"=40.
Instruction
G90 G52 v0
will delete the offset in on coordinates specified in v.
60
