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