Connect with us

Gibbions Files? PCB Design

Discussion in 'Electronic Basics' started by Chull13, Sep 1, 2007.

Scroll to continue with content
  1. Chull13

    Chull13 Guest

    Ok - I talked with a PCB design house and he said that if I could send
    him a Gibbions file of my design that would be what he needed.
    I'm not sure If I'm speeling what he said correctly in my web
    searches.
    How far off am I?


    Thanks

    My design is Very Simple whereas Egale's free software would more than
    cover what I need.
     
  2. Randy Day

    Randy Day Guest

    You mean Gerber and/or Excellon?
     
  3. Eeyore

    Eeyore Guest

    I imagine he asked you for the Gerber files.

    Since you're unfamilar with them, I'll advise you right now that supplying
    Gerber files is full of potential pitfalls. I still don't understand them fully
    myself, but be aware in particular of the 'aperture file'. You'll be better off
    finding a supplier who can read your cad's native file format to be honest.

    Graham
     
  4. Chull13

    Chull13 Guest

    Thanks!
    It was Gerber he said!
    I'll see if they can take what Eagle puts out.
     
  5. John Larkin

    John Larkin Guest

    There should be a Gerber file for each layer, an aperature file, and a
    drill file. Eagle should make them all.

    John
     
  6. Eeyore

    Eeyore Guest

    However, my understanding is that making sure they are 100% correct is not a
    trivial task.

    At the very least you should preview your gerber files.
    http://www.graphicode.com/pages/home.cfm?variable=18#_GC-Prevue

    Graham
     
  7. Al in Dallas

    Al in Dallas Guest

    I've only heard of Gerber files, not Gibbons.
     
  8. PeteS

    PeteS Guest

    I have not used Eagle for the entire design process, so I am not aware
    of the options available, but in the packages I _have_ used, there are
    numerous (and to the untrained eye confusing) options for gerber
    (RS174X, incidentally) outputs. Some manual tweaking of the output
    options is often required.
    Having said that, every layout package I've used had an output option to
    generate gerbers using the layout settings (for such things as inverse
    layers etc).

    The OP could try the automatic generation from Eagle and then look with
    the gerber viewer from Graphicode.

    Cheers

    PeteS
     
  9. Al in Dallas

    Al in Dallas Guest

    IIRC, the output of our CAD layout system was reviewed by two
    engineers for three-to-five days before we sent them to the PCB
    manufacturer. I don't know what's so tricky about the Gerber files,
    but there seems to be something tricky about them.
     
  10. Rich Webb

    Rich Webb Guest

    Indeed, for the best results, the reviewers should not be disturbed at
    all for that five day period (no boring^H^H^H^H^H^H distracting
    department meetings, for example) and should be amply supplied with
    their chosen energy boosters, such as fresh doughnuts, hot coffee, the
    occasional pizza, and so on. Optimally, they should have exclusive use
    of the "big conference room" - the one with the really giant display -
    for that period as well, the better to view the projected Gerbers.

    Any outbursts that might be overheard like "Damn! Nice shot!" should
    be interpreted to mean that somebody pointed out where a mis-placed
    via punched into a ground plane.
     
  11. John Larkin

    John Larkin Guest

    We never look at our Gerber files... we just email them to the board
    house. Occasionally the board shop will come back with a question...
    apparently they have their own, probably automated, checks. Dead-end
    guard traces especially freak them out. They also don't approve of
    inner planes that go all the way to the board edge, and sometimes ask
    our permission to pull them back a tad.

    It's very rare that we have any board problems that weren't obvious on
    the schematic.

    John
     
  12. Fred Bartoli

    Fred Bartoli Guest

    Le Sun, 02 Sep 2007 19:35:31 -0700, John Larkin a écrit:
    Yup. I really wonder too. Never had or heard of the tiniest problem about
    gerber files in 20 years.
     
  13. Eeyore

    Eeyore Guest

    I've been (indirectly) caught out by it for sure in 1999.

    It was an aperture file problem IIRC. Maybe it was Cadstar's fault that it
    didn't translate properly but the board certainly didn't match the layout. Note
    this the problem related to an elongated pad.

    You have to know that Gerber's a bit like HPGL in that it calls 'primitive' draw
    functions and that gives plenty of scope for ****-ups.

    Be careful about your drill file too.

    Graham
     
  14. Fred Bartoli

    Fred Bartoli Guest

    Le Mon, 03 Sep 2007 09:01:48 +0100, Eeyore a écrit:
    I've for long, as I guess almost everybody, switched to the extended
    gerber format which carries the apertures within the drawing files. No
    mix up possible there.
    CAD packages can still possibly do errors, but it's a software related
    problem. Don't blame the file format for this. And I don't see how this
    (SW bug) can last long or the vendor has just to die.
     
  15. Fred Bartoli

    Fred Bartoli Guest

    Le Mon, 03 Sep 2007 09:01:48 +0100, Eeyore a écrit:
    I've for long, as I guess almost everybody, switched to the extended
    gerber format which carries the apertures within the drawing files. No
    mix up possible there.
    CAD packages can still possibly do errors, but it's a software related
    problem. Don't blame the file format for this. And I don't see how this
    (SW bug) can last long or the vendor has just to die.
     
  16. Eeyore

    Eeyore Guest

    That there is this 'extended Gerber format' that embeds the aperture file has to
    be good news.

    This wasn't the case when I had my big problem with Gerbers.

    How does one know which standard one's CAD package outputs Gerber data in ?

    Graham
     
  17. Fred Bartoli

    Fred Bartoli Guest

    Le Mon, 03 Sep 2007 10:06:41 +0100, Eeyore a écrit:
    Select the format when setting/generating your gerber output.
    RS-274D for the standard separated gerber/apertures files
    RS-274X for the extended format.

    Obviously if you look at your files, you should find an aperture
    definition section in the 274X file.
     
  18. John Fields

    John Fields Guest

     
  19. Eeyore

    Eeyore Guest

    Oh thank you for your words of wisdom my God.

    I bow to your prescience.

    Graham
     
  20. John Fields

    John Fields Guest

     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-