In G-code, I and J represent the offsets for the center of an arc relative to the start point of the arc. They are used in conjunction with the G02 and G03 commands, which specify the direction of the arc (clockwise or counterclockwise).
- I: Represents the X-axis offset from the start point of the arc to the center of the arc. A positive value moves the center of the arc to the right, while a negative value moves it to the left.
- J: Represents the Y-axis offset from the start point of the arc to the center of the arc. A positive value moves the center of the arc upwards, while a negative value moves it downwards.
Example:
Let's say you want to create a circular arc that starts at coordinates (10, 10) and ends at (20, 10). You want the center of the arc to be at coordinates (15, 5).
The G-code would be:
G02 X20 Y10 I5 J-5 - G02: Indicates a clockwise arc.
- X20 Y10: Defines the end point of the arc.
- I5 J-5: Specifies the center of the arc relative to the start point (10, 10). The center is 5 units to the right (I5) and 5 units down (J-5) from the start point.
Practical Insights:
- I and J are essential for accurately defining the shape and path of arcs in CNC machining.
- By using these offsets, you can create precise curves and complex geometries with high accuracy.
- Understanding these values is crucial for programming CNC machines effectively and achieving desired results.
