Re: gEDA-user: Some footprints I tried to create

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

What I would like. Is an xml format document that allows the pcb vendors
to describe their requirements. And that at layout time you select the
vendor capability requirement document and those get used for the drc
tests.

And while I am at it. I would like to see all of the geda and pcb text
files get converted to xml.

Steve Meier

On Tue, 2007-03-13 at 11:20 -0400, DJ Delorie wrote:
> > 1. Some portions of the PCB library have values associated with
> >     footprints, e.g. "1M" resistors and "100K" resistors, etc. I thought
> >     this was unnecessary. Or maybe I'm missing some vital point...
> >     you can tell me about it.
> 
> Before gEDA, pcb was used stand-alone.  In that mode, it made sense to
> have one footprint for each part you have in inventory, not just for
> generic parts.  The m4-based library and the table of contents made
> supporting this pretty trivial.
> 
> > 4.  I did not understand the rationale for the drill dias of the pads
> >     in some of the parts in the PCB database. I have tried to select
> >     the drill dia carefully here, based on my limited knowledge of
> >     the lead diameters.
> 
> Different people designed the symbols around different sample parts.
> 
> > 5.  In my hobby electronics experience, I find that the annular
> >     copper ring around a drill hole for a pad needs to be at least
> >     10 mil in width, preferably 15mil,
> 
> YMMV.  I prefer 6-8 mil unless the hole is structural (mounting
> screws, terminal blocks).
> 
> >     But with this brilliant decision of PCB to keep all file formats
> >     as ASCII, it'll be easy for someone to write a script to patch
> >     the pin annular widths as per your preferences if you wish. (I
> >     would love to have a script which can do with a PCB layout what
> >     Eagle does in its DRC: set a min width and max width for annular
> >     rings, with a percentage of drill dia as the guiding rule for
> >     in-betweens.)
> 
> Write one.  The plugin system makes this pretty easy.
> 
> > 8.  I wanted elongated pins/pads for some of the higher-current
> >     devices. So I incorporated them. I don't know whether it'll
> >     work in reality when I include the device in PCB. I haven't yet
> >     generated Gerbers and checked.
> 
> Should, if the pads and pins have the same number.
> 
> 
> _______________________________________________
> geda-user mailing list
> geda-user@xxxxxxxxxxxxxx
> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user