Bridge earthing & multi-scales

Discussion in 'Luthier's Corner' started by mark5009, Sep 25, 2019.


  1. mark5009

    mark5009

    Feb 17, 2018
    Sydney, Oz
    Hi, guys.

    I've just been thinking about how to do bridge earthing when I have individual bridgettes for a multi-scale. I have some ideas--I'm going to be using a bridge block so I can go straight down and join the individual earthing wires in the guts--but I wonder how others have approached this issue.
     
  2. Beej

    Beej

    Feb 10, 2007
    Vancouver Island
    I've seen a metal nut employed.
     
  3. Parkwood

    Parkwood

    Oct 11, 2017
    Well, here's how i did it
     

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  4. Parkwood

    Parkwood

    Oct 11, 2017
    .
     

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  5. Parkwood

    Parkwood

    Oct 11, 2017
    .
     

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  6. mark5009

    mark5009

    Feb 17, 2018
    Sydney, Oz
    Huh. Didn't think of going to the other end. Thanks, Beej.
     
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  7. Beej

    Beej

    Feb 10, 2007
    Vancouver Island
    There's always a zero fret as well. These are assuming you ground at least one bridge piece. :)
     
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  8. 5tring

    5tring

    Sep 16, 2018
    UK
    Yes indeed. I once was patting myself on the back for being so smart and using a brass nut to ground the strings to each other, then had that horrible feeling of realisation that I had forgotten to drill the hole to ground one of the bridge pieces.
     
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  9. Smilodon

    Smilodon Supporting Member

    Feb 18, 2012
    Norway
    Just keep in mind that using coated strings may render the metal nut ineffective.

    When I use individual bridges i simply run a wire to each bridge. If the body is laminated i strongly recommend that you route a channel before you glue. On my last build I forgot and had to get creative. The solution was to drill in a V-pattern between all the bridges and the hole closest to the control cavity was drilled all the way. That way I could snake the wires from the furthest hole to the closest one. (Yes, it was a pain to thread all the wires through...:banghead: )

    DSC_1465.JPG
    DSC_1467.JPG
     

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  10. Beej

    Beej

    Feb 10, 2007
    Vancouver Island
    Sorry @mark5009 for the highjack, but @Smilodon I want to see more of that wenge topped bass! That inlaid strip looks cool... :thumbsup: :D
     
  11. Kriegs

    Kriegs

    Feb 14, 2018
    On my 6 string bass, I laid a strip of copper tape under the individual bridges, ran my ground wire to that strip and sanded the undersides of the bridges where they sit on the copper strip to ensure good contact.
     
  12. One interesting thing I found researching, that I hadn't noticed before I started looking, is that Dingwall runs a wire on the surface of the body between the individual bridges. It is subtle, but definitely there. Ex:

    http://www.bassdirect.co.uk/bass_guitar_specialists/Dingwall_NG_Bass_files/NHTop.jpg

    When I eventually get around to doing it I think I will go the over-ambitious route and try to build a custom 1-piece bridge.
     
  13. 5tring

    5tring

    Sep 16, 2018
    UK
    Good point. Would coated strings make all types of bridge grounding ineffective?
     
  14. SlingBlader

    SlingBlader

    Oct 19, 2013
    If this is true, wouldn't it render any string ground ineffective?
     
  15. Beej

    Beej

    Feb 10, 2007
    Vancouver Island
    The ball ends in a top mounted bridge tend to take care of this in my experience. I put tapewounds on a string through once, and had to run a wire from each ferrule on the back up to the bridge to deal with it. Kind of unnecessary though, as I was not a fan of them and removed them fairly quickly. :D
     
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  16. Smilodon

    Smilodon Supporting Member

    Feb 18, 2012
    Norway
    I have been meaning to do a build log on that bass for a few months. I'll see if i can find the time to do that soon. :)

    I don't think the core of strings are coated. Besides, the ball tend to dig into the metal of the bridge slightly. A nut is (should) be a much smoother interface that won't penetrate the coating as easily. Having that said, I haven't actually done any measurements to check. Most of my basses use EMG pickups, so bridge ground isn't much of a concern. I usually pull ground wires to bridges just to be on the safe side. Much easier than trying to fix it later.

    Having that said, i'm not entirely sure that there have to be metallic contact between the bridge and electric ground. the painted metal surfaces may act as a capacitor that is large enough to kill the noise. After all, the impedance in an open string is very high. I can't remember anybody complaining that painted bridges are a problem. Just a theory. :)
     
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  17. SlingBlader

    SlingBlader

    Oct 19, 2013
    Ah, yes, the balls! I'm always forgetting the balls... :roflmao:
     
  18. So if you have coated strings and a string it through body, is it recommended to ground each ferrule too? That would definitely be a pain, but I guess possible.
     
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