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	Sun, 13 Sep 2015 08:05:47 -0700 (PDT)
Date:	Sun, 13 Sep 2015 17:05:42 +0200
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] Apollon
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> > Holes usually span all layers but a buried via only span some layers.
> 
> Yes. There is the start_layer_id and the end_layer_id to specify which
> prepreg _AND_ conductive layers shall the fab house drill. Or do you think
> anything else?

No, I guess it is allowed to put holes at same coordinate although with some non conductive layer in between at least in the layout program.

> > There is also the case with plugged vias, with hole in the board but
> > not the copper or?
> 
> I don't know what is plugged via, but
> 
> http://www.pcbcic.com/docs/Via_and_SMask_design_guide4.pdf

I guess they are all there.

> says that a plugged via is filled with insulator material. This can be done.
> 
> I don't really understand what is the use of a via without copper. Can you
> elaborate?
Neither do me but someone apparently found it useful.

> Take this user story:
> 
> 1. You are editing your top level pcb.
> 2. You find out that you need some change on one particular instance of
> a footprint.
> 3. You press on "Down footprint"
> 4. You now edit this footprint.
> 5. When you satisfied with your changes, you can either
> 6a. Save this footprint, and all the instance will be changed, or,
> 6b. Save as something else, and replace the sub-pcb in the relation table.
> This will affect only that particular instance.
> 7. You get a beer.
> 
> Later, you can export your sub-pcb to your library.
> 
> How's that sound?

Good!



I just wrote something about a pin object. As is know in pcb there is Pin[...] and Pad[...]. With a pin object there would be inside the pin object a drilled plated hole with circular copper on the appropiate layer. The Pin[...] and Pad[...] may still be useful for shorthand notation but be able to use the ordinay drawing objects is more general for example to draw an antenna.

It might be better to use ordinary drawing objects inside pins instead of special drawing objects because it keep down number of different primitives and to export gerber files you output all drawing objects on a particular layer regardless if they are directly on pcb, inside a footprint or insida a pin.


Nicklas Karlsson

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