User manual

ADT-HC4500 CNC Flame/Plasma Controller
80
As the above picture, if calculated by relative coordinate, the coordinate of the points in picture are as
follows:
1. Point A is the origin, the coordinate is (X0, Y0);
2. Point B is (X50, Y50) relative to point A;
3. Point C is (X50, Y50) relative to point B;
4. Point D is Y-50 relative to point C;
5. Point D returns to point B, and the coordinate is X-50;
2.2 Absolute coordinate
In coordinate system, if the coordinate of current point is calculated from the origin, it is called absolute
coordinate. As picture 2.1, if calculated by absolute coordinate, the coordinate of the points in picture are as
follows
1. Point A is the origin, the coordinate is (X0, Y0);
2. Point B is (X50, Y50) relative to point A;
3. Point C is (X100, Y100) relative to point A;
4. Point D is (X100, Y50) relative to point A;
5. Point D returns to point B, and is (X50, Y50);
3. G instruction
3.1. G92 reference point setup
Set the coordinate of processing origin (reference point) of program. It should be put at the beginning of
program.
Format: G92 X0 Y0
If G92 is not followed with X/Y coordinate, the current coordinate (X, Y) is taken as the reference
point. Usually, when locating using the machine origin, G92 would not have X and Y content.
3.2. G21/G20 Metric /Imperial setting
Set the unit of length for the processing. The default is metric system.
G20: Imperial (Unit: inch)
G21: Metric (Unit: mm)
Format: G21
This instruction is for setting the length unit during the processing as (mm). It is usually written in
the second line of program (unless otherwise change temporarily), which is the next line of G92, without