G-code help (EDM)

peterh93

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Jan 19, 2023
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TLDR
G03 with i and j used on a angle gives me a bigger circle than it should do.

hi guys so im trying to extract a cylinder from a block ive already extracted from in the past using the edge of a prevouis extraction.

(See photos)

so from the edge of the circle im cutting in a diagonal to the outer edge of the next cylinder (x3.9 y5.2) and then doing my circle from there.

so on a normal circle cutting onna straight line to the outer edge for a 7mm circle youd do:

G92 x0.0 y0.0
G01 y5.0
g03 x0.0 y5.0 i3.5

But when im doing it on a angle to keep that circle on the angle i do:

GG01x3.9 y5.2
G03 x-3.9 y5.2 i-3.5 j3.5

Now on the graphics it looks.okay except the circle is actually bigger than 7mm. I can remove the j3.5 but the cirlce is no longer follwing the angle and staying parallel with the cutting line/angle!


hope this makes sense probably explained it really bad but hoping someone knows!

Also if anybody has nay idea where i can learn more g-code/edm and how to operate it etc that would be great!

Thanks
Peter
 

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