Re: [Emc-developers] Building closer community FreeCAD & LinuxCNC

[Steffen Möller via Emc-developers]

> Gesendet: Mittwoch, 13. August 2025 um 14:06
> Von: "andy pugh" <bodge...@gmail.com>
> An: "EMC developers" <emc-developers@lists.sourceforge.net>
> CC: "Steffen Möller" <steffen_moel...@gmx.de>
> Betreff: Re: [Emc-developers] Building closer community FreeCAD & LinuxCNC
>
> On Wed, 13 Aug 2025 at 12:50, Steffen Möller via Emc-developers
> <emc-developers@lists.sourceforge.net> wrote:
> 
> > * G-code compatibility - what can we do to ensure that anything that 
> > FreeCAD generates can indeed be interpreted by LinuxCNC in an automated 
> > fashion?
> 
> LinuxCNC supports splines and NURBS. As far as I know no CAM software
> outputs those.
> In fact, many CAM softwares don't even output arcs....
> 
> https://linuxcnc.org/docs/stable/html/gcode/g-code.html#gcode:g5
> 
> I am not at all clear if there is any technical advantage in
> outputting splines / NURBS from a CAM other than smaller file sizes in
> some cases, but that's not really of much value as most CAM G-code is
> never read by human eyes and the file size is small in real terms.

I like it. So we would have a best-possible semantic equivalence of 
what is modelled with what is described in G-code.

I recall some issue of FreeCAD-LinuxCNC compatibility that you, Andy, fixed.
Found it:

https://github.com/LinuxCNC/linuxcnc/issues/1528

I thought it would be nice to catch such issues somehow automagically,
maybe with a couple of parts modeled in FreeCAD with various sorts of
corners, edges, shapes and forms that we could then somehow run and compare
as part of our CI testing.

Best,
Steffen



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