Fusion 360 is CAD/CAM software, but in your case, you're just using the CAM portion.
Sort of.Someone told me post processors turn 3D files into readable machine codes (Gcodes)
In Fusion 360, you use the CAM environment to create toolpaths from your 3D model. The post processor converts those toolpaths into g-code.
A post processor is an instruction set to format the g-code in a particular way, to suit a particular machine control. Fusion 360 comes with a large variety of post processors.
Basically, yes.Is the GRBL universal gcode sender a post processor (I don't think it processes anything though?) or just a receptable for accepting processed gcodes from Fusion 360?
No. CAM software does not communicate with machines.Can't Fusion 360 directly communicate with the CNC machine?
Never used GRBL, so can't help with it's limit switch handling.