Summery:
G2 clock wise (CW) move.
G3 counter clock (CCW) wise move.
(G1 linear move.)
(G0 rapid traval)
And these codes are generally always model, that is, stay active until canceled.
G, X, Y, I, J, format.
The position BEFORE the G2 or G3 must lay on the arc.
The X & Y in the G2 or G3 block also lays on the arc.
The I & J tells the control where the center of the arc is.
The I & J standard format is the signed incremental distance from the start point, that is, the postion BEFORE the current active G arc block.
Then next most common I & J format is the I & J are the absolute coordinates of the arc center (I = X center, J = Y center.)
On old NC controls the I & J are the unsigned incremental distance from the start block postion to the arc center. An in that old format the end G arc code end X & Y coordinate must lay within 90 degress of the start block coordinate. The old quarter quadrant arc block format.
There were a few other formats that were in use (non-G2 or G3 formats.)
In the standard format:
I is equal to (the center block X - the start block X coordinate.)
J is equal to (the center block Y - the start block Y coordinate.)
The radius is equal to the square root of ( I^2 + J^2)
The X & Y in the block is the end point of the arc move.
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