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Ferrite core mounting, U- brackets anywhere?

Discussion in 'Electronic Design' started by Joerg, Jul 5, 2011.

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  1. Joerg

    Joerg Guest


    Is there a company that offers plastic or metal U-brackets of numerous
    sizes? Preferably domestic (US). Grainger and McMaster are rather
    limited in size choices.

    I have yet another RF project where large ferrite cores are needed. This
    time squarish double-hole cores of roughly 1.15" by 1.15" and 0.56"
    high. And as usual the ferrite mfg offers nothing in terms of mounting
    HW, they all seem to assume that having such heavy cores slosh around or
    being buried under a blob of hot glue is going to be ok. I want to rivet
    them to a circuit board, or screw it down if needed. Cable ties are not
    so great because they become brittle over the years and break. Lacing
    cord would be excellent but people stare at me when I suggest that,
    probably thinking am a Luddite :)
  2. Tried FormCo ?

  3. Joerg

    Joerg Guest

    The BN-43-7051 from Amidon top of the page):

    The ones on page 5-43 don't look solderable and too big, our core would
    slosh around in there. But one of those in solderable and smaller would
    certainly be cool. Not sure if they'd sell to us after we celebrated
    their voting off of the island yesterday :)
  4. Joerg

    Joerg Guest

  5. Joerg

    Joerg Guest

    If we absolutely have to. The risk is that a major hit during transport
    might cause one or both to rotate out of position.
  6. Joerg

    Joerg Guest

    Thanks! Will write to them right now. In case anyone else is in need:

    Couldn't find Robison.
  7. Joerg

    Joerg Guest

  8. Joerg

    Joerg Guest

    Thanks, but looks like the don't have anything suitable under coil
    mounting products. But let's see what Lodestones responds.
    Neat. Unfortunately most of the time I get RF projects it's higher power
    stuff. So I need the big old fat cores.
  9. Joerg

    Joerg Guest

    I had checked them. No mounts, not for such big cores.
  10. If I have a chance tomorrow, I'll scan the Catalog into a PDF and email
    I think it's just E-I core stuff but they might have something.

  11. I believe the Philips Ferrite core line is part of them now.

  12. Joerg

    Joerg Guest

    Thanks, Martin, but only if that doesn't tie you up at the scanner.

    I was kind of surprised that Grainer and McMaster had nothing. I mean,
    you can get everything else including salt and pepper shakers there.
  13. Joerg

    Joerg Guest

    I've seen versions where the thick part would ratchet into the hole just
    like a cable tie but at a finer pitch. However, personally I do not
    trust plastics over the long haul. Some last forever, others give up
    after a few years. And you never know. Some day the elasticity has sort
    of evaporated and ... ping ... hiss ... *BAM*

    This is for med gear so I don't want to take any chances. Machines like
    that can remain in service for decades.
  14. Ecnerwal

    Ecnerwal Guest

    So, go with lacing cord - and if anyone looks at you funny, point out
    that you are doing that for the same reason that the military does - and
    you can look to mil-spec suppliers to find the stuff, last I bothered to
    look. You certainly won't find anything as versatile from a "one part
    number in stock will hold down any of a wide range of cores, even if the
    cores change" point of view.

    Allied and Newark both seem to still have it. Here's the general
    description of the types of Alpha Wire cord available at Allied:
    I laced the harness for my CNC router - it was the most efficient way to
    make it work at a price I could stand...while it may see little use
    outside the military in "present-day" throwaway crap-tronics, there's
    still a place for it where reliability matters over the long run. So use
  15. Joerg

    Joerg Guest

    They even have the cool black stuff: Products&MER=PPSO_N_C_EverywhereElse_None

    Yeah, but it has two downsides: Drill holes in FR4 much be rounded to
    make this kosher. Then, I'll have to make an elaborate and
    ECO-releasable hand-drawing about how to lace it, knot it, and all that.
    Else they'd have to hire an aircraft electrician :)
  16. Joerg

    Joerg Guest

    Can't use a toroid because I couldn't get the leakage inductance down
    low enough.

    Have to use the big square BN-43-7051 double-holer from Amidon:

    They cater more to the injection-molding crowd.
    Well, I need something to hold several roughly 1" square chunks of
    ferrite on the board, and they are fairly heavy.
  17. Joerg

    Joerg Guest

    They are all round :-(
  18. Joerg

    Joerg Guest

    That's what a friend of ours would say. He is over 80 now and when I
    talked with him about his job after the military he summed it up this
    way: "Well, I just couldn't work with civilians" :)
  19. I took a look, there is some hardware, probably nothing you can use.
    I did use the txfrmr brackets, bigger than the Keyelco stuff.
    Here is a link to the catalog.

    We have a Konica-Minolta Biz Hub, set it and forget it, works great.

  20. Joerg

    Joerg Guest

    Stainless steel cable ties, that's actually a darn good idea! Slotting
    is no problem. They just have to be thin enough so they "snuggle in" and
    we can tuck the excess away. There's several kilovolts of isolation in
    this module but no problem. Thanks for the hint.

    Come to think of it, even a skinny hose clamp might work. In the US
    those are usually stainless steel.
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