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Need Earth Ground Without Drilling a Hole

Discussion in 'Electronic Design' started by D from BC, Jun 14, 2007.

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  1. D from BC

    D from BC Guest


    Cool.. :)
    D from BC
     
  2. D from BC

    D from BC Guest

    Let's say this is the screw ( ==<| )
    It's the < that's 100deg...if I understand..
    I'll look around for those..

    I don't know much about welding 4mm threaded studs on aluminum
    sheeting but I like the idea because no drilling, grinding, hammering
    or clipping..
    I also can dodge finding special rivets, tools, anvils and fasteners.

    But..I'm not getting a welder just to weld studs 10 times/year... :(


    D from BC
     
  3. Rich Grise

    Rich Grise Guest

    That's nothing new - Superman was walking through walls in the 1950's, by
    interleaving his molecules with the wall's. ;-)

    How about a countersunk hole and a flat-head screw?

    Good Luck!
    Rich
     
  4. Rich Grise

    Rich Grise Guest

    AFAIK, it's an aesthetic choice, i.e., do you want the teeth to show or
    not?

    Cheers!
    Rich
     
  5. Rich Grise

    Rich Grise Guest

  6. D from BC

    D from BC Guest

    Ohhhh.. :)
    Thanks
    This looks good..
    Lots of teeth to bite into the metal for 15amp current.
    And compression to prevent looseness.

    My app is exposed to vibration from passing traffic..

    Maybe Loctite threadlocker could be a way of dodging washers?
    D from BC
     
  7. John Fields

    John Fields Guest

    ---
    You could use Loctite, but the washer is there to bite into the
    aluminum so you'll get good electrical contact through the oxide.

    If you use PEM threaded studs all that electrical stuff happens
    automatically when the stud is pressed in and then it's your choice
    whether you use an anaerobic adhesive and/or lock washers for the
    mechanicals.
     
  8. Rich Grise

    Rich Grise Guest

    That won't give you a reliable connection - you need to dig through the
    oxide and form a gas-tight metal-to-metal contact.

    But Loctite is not a bad idea either - just keep the washer for the
    electrical continuity.

    Good Luck!
    Rich
     
  9. Mark Zenier

    Mark Zenier Guest

    PEM has studs which are spot welded on. (I think it was PEM, but it was
    also 25 years ago). But you'd need to find a sheet metal shop that had
    the custom welder for a one-off.

    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
     
  10. John Fields

    John Fields Guest

    ---
    Here's a find:

    http://www.smithfast.com/msflathead.html

    Now you can figure out whether a 100° screw will fit properly!
     
  11. Jamie

    Jamie Guest

    I'm only guessing, is this like a pot metal box?, if so, how about a
    partial hole drilled and use a bottom tap to put in a bonding lug?
     
  12. Jasen

    Jasen Guest

    after about a minute it does.

    if the live shorts to the box hundereds of amps will flow.

    the earth connection has to keep the box at a safe voltage until the
    breaker opens.

    Bye.
    Jasen
     
  13. D from BC

    D from BC Guest


    Yeah.... that breaker needs some heating time... It's a thermal
    mechanical device. Meanwhile current runs high.
    I thought shooting for a 15amp continuous fault current earth ground
    connection might get me in the ball park.
    Hopefully the breaker trips before the earth ground connection burns
    open due to contact resistance..
    D from BC
     
  14. Ross Herbert

    Ross Herbert Guest

     
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