NCT Group 99M, 2000M manual Local Coordinate System

9 Coordinate Systems, Plane Selection

If, e.g., the tool is at a point of X=150, Y=100 coordinates, in the actual (current) X, Y work coordinate system, instruction

G92 X90 Y60

will create a new X', Y' coordinate system, in which the tool will be set to the point of X'=90, Y'=60 coordinates. The axial components of offset vector v' between coordinate systems X, Y and X', Y' are

v'x=150-90=60,

and

v'y=100–60=40.

Fig. 9.2.4-1

Command G92 will prevail in each of the six work coordinate systems, i.e., an offset v calculated for one of them will be taken into account in the rest, too.

Fig. 9.2.4-2

LNotes:

–The offset of the work coordinate system set with instruction G92 will be deleted by execution of "end of program" instructions (M2, M30) and by resetting the program.

–Instruction G92 will delete the offsets of the local coordinate system (programmed with instruction G52) on the axes included in the instruction.

–Instruction G92 offers a convenient way of the cyclic position indication of the indexing rotary table performing several turns. If, e.g., axis B has been turned into the position 360°, the axis can be moved to position 0° without any physical movement by programming G92 B0.

9.3 Local Coordinate System

When writing part programs, it is sometimes more convenient to specify the coordinate data in a "local" coordinate system instead of the work part coordinate system.

Instruction G52 v

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