On Jun 4, 2008, at 10:16 AM, John Luciani wrote:
On Wed, Jun 4, 2008 at 12:42 PM, Mark Rages <markrages@xxxxxxxxx> wrote:
On Wed, Jun 4, 2008 at 11:30 AM, Larry Doolittle
<
ldoolitt@xxxxxxxxxxxxxxx> wrote:
> Disorganized and questionable quality component libraries.
> This has been discussed to death, but without any concrete
> results.
>
> - Larry
>
They are far better than the included footprints. The included ones
are terrible (as in, I've had to throw away boards because they were
unusable). It is not very user-friendly to ship broken footprints,
then when users complain, blame them for not double-checking all the
footprints and/or making their own library.
It is good to hear that you have found by library useful. Thank you.
It is not fair to group *all* of the user contributed libraries together.
Some work some may not work but this is true for commercial and
non-commercial EDA packages. I have yet to see a CAD
group be able to use any EDA tool without some sort of library review.
I agree that some symbols (including mine) may be completely broken
but others may be broken for your process requirements while meeting
the process requirements of others. I believe there are a group of footprints
shipped with PCB that were generated to IPC-7351. IPC-7351 specifies
three process capabilities. For these symbols choosing the wrong one
could result in a throw-away board.
You should always check that a footprint meets your process requirements
and matches your component specifications. I am hoping that others double-check
my footprints before I make throw-away boards ;-)
(* jcl *)
I Agree with John here I extensively use the shipped footprints, but i review them like a hawk. printing out your board 1 to 1 is a must.... place the component on the paper, does it line up right?
Where I work, we have 2 levels of boards, proto and mass production. the mass production boards have their footprints gone through with a ultra fine tooth comb, proto boards not so much. our library is 100% our own. We don't even use Cadences SO-8 footprint!
Sorry gEDA/PCB is not in out mass production workflow......
hardkrash
--
http://www.luciani.org
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