Gcode Radius issue, G3 using G91, Openbuilds Control

Hello,

I am new to all of this so bare with me.

Context:
I am building a custom machine using the C beam XY gantry in conjunction with a 2x72 belt grinder (mounted horizontally with a contact wheel) to grind knife bevels. I am modeling the cut in fusion then creating a drawing of the exact XY path I need. I have then taken that DXF to DXF2GCODE (free software) and made gcode out of it. I've then imported that gcode into Openbuilds control to modify it. First I deleted all the z axis because this machine is XY only. That program worked but does not have any stepovers to gradually remove material, I manually changed the zero and walked the program in as a test. It works.

Now I need a program that has all the correct stepovers. The gcode that DXF2GCODE gives me is G90 (absolute). I am trying to convert this block into G91 (incremental) so that I can copy it with the stepovers in between. The X Y conversion was easy but converting the I J values to R values isn't working as well.

Issue:

I have the correct R values from my Fusion 360 drawing, for some reason The open builds control is showing me the incorrect radii in the simulation. The pictures will tell the story better than I can.

How do I get these G3 lines to do what I want?

Screenshots:


The Fustion 360 drawing is what I want the path to look like. The simulator with the bumps, instead of smooth connecting curves is what I'm getting out of Openbuilds cotrol.

If you've read this far I appreciate you, any help with the radius issue is much appreciated. I plan to show the machine after I get it running properly.

 

David, Thank you very much for this advice. I was making it so much harder than it needed to be. Fusion to gcode works like a champ and I've been running and modifying the toolpaths for the last few days! I'll share the machine setup in the coming weeks.

Thanks again!