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Date: Mon, 11 Jan 2016 14:08:55 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Primitive electrical types --> layers
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> > your intended
> > cut-out/slit/etc .. now possibly making this "Keep-out" in other layers
> > may be desirable, but since you're using a milling cutter to do the
> > outline, you need a path for it to follow. Perhaps you can 'shade' this
> > in the GUI - I see no need for additional complexities making polygons,
> > figuring out perimeters, etc, when you can line-draw and need to anyway.
> > Perhaps having an outline 'layer' might help you achieve what you're
> > hoping for? We've even milled curved board outlines, using the curve
> > tool, and our fab. have managed this perfectly without problems.
> >
> 
> 
> The convention is usually, that you model what you want as the physically
> produced, post-manufacturing shape. (This is the same with mechanical CAD
> too)..

Yes board material will be a filled polygon with cut out where there are holes. Then both edges and where there is material will be well defined. I consider a drilled hole equal to a round cutout because result is the same. As is now holes are implemented as a pin with a drill size which is equal to a cut out thru all layers even though it end up in a drill file instead of a on the gerber layers.

> Tool-paths, drill size corrections (allowance for plating, or approximation
> of nearest available drill size), are the scope of the CAM post-processor.

Correct.

> ...
> This is why all the more advanced board representation formats model an
> explicit outline, with poly(curve) type primitives, so an explicit design
> intent of the finished shape can be modelled. This is effectively a
> "polygon" shape in PCB, especially once the patches adding support for
> curved edges are merged. To avoid ambiguity in interpretation, this
> "polygon" needs (I believe) to be a first-class property of the stack-up
> model. (Something I'm working on designing and adding currently).
> 
> Peter

A "polygon" shape PCB have an outline and may have holes. Sound great!

I guess property/flag for edge plating on each object would be good, as is now I think plating is only possible to model on holes.


Nicklas Karlsson