I have just upgraded to a Chinese router after using a Sherline mill that I converted to cnc 20 odd years ago with a Compucut controller. I only used it to cut flat plate ally or pcb board so nothing special was needed. All of my G-code was very simple with only G0, G1, G2 and G3 used. No tool offsets were used as I added in the offset when drawing the part in AutoCad.
Now I find none of the code is usable as it shows all jumbled up on the Mach3 screen although it shows up correctly in BackPlot Editor.
I decided to move forward by upgrading my G-code to be compatible with Mach3 but I have fallen on the first hurdle as I can't even cut a 6mm hole with a 4mm tool. For some reason it wants to cut to the outside all the time so the holes are far too big. I tried using G41 and G42 but one cuts the same and the other crashes the program and it stops in the middle.
Can anyone help with the code to cut a 6mm hole with a 4mm tool?
Thanks for reading