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VME card ejectors

Discussion in 'Electronic Design' started by Joerg, Jun 6, 2007.

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  1. Joerg

    Joerg Guest

    Hello Folks,

    Ok, first, those card ejectors from RichCo and other mfgs don't seem to
    be in stock anywhere. Is there a place that sells them by the dozens and
    not truck loads?

    Other: We've designed the boards per spec. Holes for the ejector 250mils
    in, boards exactly Eurocard length (160mm) but the boards aren't flush
    with the front rails of the VME cage. So maybe those ejectors wouldn't
    work anyhow.

    Are there any "pull tools" available? We used to have those for
    ultrasound machines because ejectors were rattling to much. But that was
    many moons ago and I don't have the foggiest where they came from.
    Basically they caught the holes and then you cantilevered the board out.
    Of course, engineers didn't want to be sissies so we kept pulling by
    hand until thick callusses developed.
     
  2. John Larkin

    John Larkin Guest

    We use the Schroff ejectors. The classic eurocard stops about 0.1" shy
    of the back of the front panel, but sometimes we cheat and close the
    gap to almost zero, for various reasons.

    Did I send you my board layout? I forget. If you're using my dims, I
    could send you a few Schroff ejectors and a panel to try, and a
    solder-sample bare board, just for fun. Heck, I could just send you a
    whole VME module.

    Hmmm... our standard board (the standard setback one) is 160 mm wide,
    with the ejector hole 140 mils in from the front edge of the board.

    Our longer board, the one that hits the rear of the front panel, is
    6.400" wide, 162.56 mm, and the ejector hole is 240 mils from the
    board edge.

    John
     
  3. GPE

    GPE Guest

    VME?!?!
    Wow, I remember VME... barely.

    We used Schroff for VME front panels and hardware.
    They used to advertise regularly for custom VME front panels in trade
    magazines ... and a picture of my panel was always the one in the middle.

    We never had problems with fit on the board. And it has been such a long
    time since I've worked with these - I can't help with dimensions.

    Good luck,
    Ed
     
  4. JackShephard

    JackShephard Guest

    Liar!
    You got them pulling on your dick.
     
  5. JackShephard

    JackShephard Guest

    Another forgery by Lamey The ForgeTard.
     
  6. John Larkin

    John Larkin Guest

    VME is doing well in the aerospace biz. Its demise has been predicted
    for decades, and it continues to grow. CPCI was to be one of its many
    predicted killers, based on leveraging commercial silicon, but that
    silicon turned out to have half-lives measured in years or maybe
    months, which isn't good for product lifetime. PCI sucks anyhow, with
    its complexity and limited electrical bus length.

    There has been some consolidation in VME, especially with GE Fanuc
    "pulling a Vishay" and buying up everybody in sight. That has resulted
    in a lot of boards going unsupported or obsolete, which is fine by me.

    What's bizarre is how many people are fighting for the VME embedded PC
    business, which sounds like a horrific amount of work to sell a
    Pentium-based VME master card for numbers like $2K, when I can sell a
    waveform generator for over twice that.

    John
     
  7. Joerg

    Joerg Guest

    Yes, I've got your CAD file.

    Ah, that's why. We had used the dims from the Interfacebus web site for
    the ejectors because they were somewhat of an "afterthought". So I guess
    we won't be able to use ejectors :-(

    And we used 240mils on the ones that didn't hit the panel. Sigh...
     
  8. Joerg

    Joerg Guest


    So did we. But they seem to be in the habit of not answering emails.

    We are actually using the VME as a HW-addressed SPI bus and, gasp, at
    3.3V. But don't tell anyone about that, might be against some kind of
    unspoken law...
     
  9. Joerg

    Joerg Guest

    Just like lots of people predicted the demise of CD4000 logic 1-2
    decades ago. Luckily I did not listen.
     
  10. Joerg

    Joerg Guest


    Yeah, I thought so. No idea why some people have to do that.
     
  11. John Larkin

    John Larkin Guest

    It's a 115 drill, so you could re-drill it 100 mils closer to the
    front. The ugly figure-8 hole would be mostly hidden under the
    extractor. Might work.

    Hey, we're getting together a box full of old boards to go the the
    dump. Want any?

    John
     
  12. ["Followup-To:" header set to sci.electronics.design.]
    I simply love the 4000B series, including the somewhat chaotic choice of
    functions. It's definetely pre-CPU (pre-bus-architecture in general) age.

    robert
     
  13. John Larkin

    John Larkin Guest

    VME is so simple you can do it with TTL gates. We usually use a
    smallish Spartan FPGA as our VME-CPU interface, and embedd maybe a
    256-word transparent dual-port memory inside, shared between the VME
    bus and our embedded uP. It's easy. The bus part of a system should be
    trivial and not gobble up much real estate.
    Yup. CPUs don't stay in production long, especially Intel CPUs. We're
    still using MC68332's, which seem to be hanging in pretty well.

    John
     
  14. Joerg

    Joerg Guest

    Thanks for the offer but we don't need any right now. Yesterday I
    checked the Schroff box and it's one of those geared for front panels.
    From the holes to the upper and lower aluminum profile it's >400mils,
    meaning that even if we had the ejectors at the right depth they would
    not be able to grab. Drat. Oh well...
     
  15. Joerg

    Joerg Guest

    I am using Japanese caps in my designs :)))

    Panasonic et al.
     
  16. Joerg

    Joerg Guest

    When visiting an old client recently I found that one of my 80C51
    designs is still in production. Almost 13 years now and counting.
     
  17. Rich Grise

    Rich Grise Guest

    How about an FPGA/CPLD on an adapter board, with a <whatever> core?
    e.g.: http://www.fpga.ch/ipcores/cpu.php

    Cheers!
    Rich
     
  18. Joerg

    Joerg Guest

    Right. But that's the same when buying cloth insulated litz wire. Our
    Towe's Ford Museum could whip you up a spool but it'll cost ya. I said
    good bye to standard TTL almost the instant 74HC came out. Not 74HCT, I
    never liked those. 74HC is cheap, uses next to nothing in quiescent
    power and works nicely on batteries such as 2-3 AA cells.

    If you can live with ye olde 74LS04 those are a lot cheaper.
     
  19. GPE

    GPE Guest

    It is nice to see old stuff still chugging along. The Intel 8051 series has
    got to be the longest lasting and most popular series.

    I see some of my old creations nearly every day. Designed and built wayyyy
    back in 1990 -- a VME processing board based on ... Inmos Transputers.
    Definitely not in production anymore but these were fun boards to work with.
    And, those Transputers sure were wonderful critters back in their day.

    -- Ed
     
  20. GPE

    GPE Guest

    I actually have a 6502 design based on a Spartan-3 FPGA. Has a 6502 plus
    three 6532's and a wad of glue logic all within one of the smaller Spartan-3
    series. Too bad this won't "plug into" the existing board though.

    -- Ed
     
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