Re: [Pcb2gcode-devel] Avoiding of milling the traces twice

[Patrick B. <pbi...@us...>]

On Wed, 16 Nov 2011 21:56:40 +0100
Filip Dominec <fil...@gm...> wrote:

Hi Filip,

good to hear it works for you.
My machine has play-free guides and actuators, so repeatability is not
an issue for me (even with 0.5mm pitch TQFP ICs).

I've been thinking about the optimisation you propose, but I don't see
any work on it from my side happen anytime soon (not this year), I'd
rather improve --extra-passes.

Internally, pcb2gcode represents toolpaths as huge lists of coordinates
(icoords; coordinate list using inches), and for each layer a list of
toolpaths is created. That list is passed down from the "Surface" class
that does the image processing to "Layer", "Board" and then an
"Exporter".

I think Layer::get_toolpaths() could be a good starting point here.
Might even be not that much effort.

If you get something to work, I'm always happy to accept patches ;-)

-- Patrick


> Hi, I have succesfully tested pcb2gcode on my home-build PCB milling
> robot and it works great, except for one issue. I use the Voronoi
> feature and I need that no path is milled twice. 
> 
> Not only the double-pass of almost all traces doubles the manufacture
> time, but also the second pass sometimes wipes off the subtle 
> connections for SOIC circuits due to little imprecision of my machine. 
> 
> What should I do to help fix this? Is some work underway or should I
> download the sources and begin experimenting with the code?
> Filip Dominec
> 
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