Old guitar with a bowed neck

Discussion in 'Acoustic Soundboard' started by Willmunny, Aug 18, 2021.

  1. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    I bought an old takamine g 126 a few months ago, no nut, no bridge, beat to h e double toothpicks. 10 bucks.
    Solved the bridge and nut, just wondering is there any way, short of removing the neck to take the bow out of the neck?
    Technically its playable, but I would love to save this guitar
    Obviously no truss rod, thanks in advance 20210818_082142.jpg
     
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  2. dirocyn

    dirocyn Most Honored Senior Member

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    First thing, just to be sure--I can't see the strings well enough to tell, are those nylon strings? This is a classical guitar and should have nylons on it; steel strings will have too much tension and could cause warping.

    Some people have had success straightening necks by laying the neck across sawhorses and then using weights to pull the neck straight. If that's not convenient you might try putting a stout board (4x4 maybe) against the fretboard, draw the neck flat against it with ratchet straps. Leave it that way for several days and then re-check to see if it's changed any.

    Wherever you bend it to, it will probably spring back the other way a little bit. But obviously if you bend it too far you create a whole new problem.
     
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  3. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    They are nylon, I was wondering if something like this was feasible.
    It has a big bow with no strings on it.
    I think it was leaned against a wall for a long time
     
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  4. thomquietwolf

    thomquietwolf Dr. Stratster Gold Supporting Member Silver Member

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    Nice size...
    Hope someone gives you a fix...
     
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  5. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    I really dig it, I kind of look at as a stray animal I found lol
     
  6. sssstratsss

    sssstratsss Strat-O-Master

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    Clamp it on a table for a few weeks
     
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  7. Malurkey

    Malurkey Senior Stratmaster

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    I used this setup:

    E97B30B5-FE5B-4E09-9E2B-9839DD0807B7.jpeg

    In my case there was exactly 8kg of water in the bucket. Cover with an electric blanket for heat and check every couple of hours to see if it’s straight enough/bent the way you want it.
     
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  8. Dreamdancer

    Dreamdancer Senior Stratmaster

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    Thats a job for an actual luthier no doubt....some would say a refret with slightly larger tang would force the neck to bow out but how much i cant really say.....
     
  9. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    You may be right, I am going to go with the sawhorse weight method.
    If it's free it's for me.
    Thanks for the replies folks
     
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  10. rolandson

    rolandson Dr. Stratster

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    Neck bow can be corrected by clamping to a straight edge. It takes a lot of time. Luthiers use heat occasionally as well. Hideo Kamimoto and Dan Erlewine both have a book or two on the subject.
    Other than 12th Fret or Portland Fret Works, I got nothing...
     
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  11. vid1900

    vid1900 Most Honored Senior Member

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    I'd use electric heat strip and clamps, heating the glue, causing the fretboard to **slip**.

    When the glue cools, the neck is (hopefully) flat again.

    This will happen when a guitar is left in a really hot garage, or auto trunk. In Florida, one day in a hot trunk will do it - no joke
     
  12. trapdoor2

    trapdoor2 Senior Stratmaster

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    I have a neck heater that is specifically made to do that. Clamps on the fretboard, dial the heat, let it roast for X time, let it cool down. Got it from old-time luthier's estate. Never used it myself.

    Generally speaking, it is supposed works well for classical/low tension stuff. Lesser results with high tension. Poor results with mandolins...

    I would find a piece of 2" square-section tubing and strap/clamp the neck to it. Heat the whole thing with a heat-gun or hair dryer...try not to set fire to it. Let it cool overnight, remove the clamps, etc.

    Check it after: worked? String it and check again. Partially worked? Reinstall straightening tube/clamps and wedge ends to overbow it a little. Heat, beat & repeat.
     
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  13. SoulSurfer

    SoulSurfer Strat-O-Master

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    Did I miss something here? Is it back-bowed, meaning the headstock is above plane on the guitar's soundboard, or the opposite? I think it has something to do with heat and clamps, possibly, but I would check out some YouTube vids.
     
  14. Dreamdancer

    Dreamdancer Senior Stratmaster

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    I think he means up bowed thats why he said that the guitar is playable... thats also why i told him bigger frets would force some back bow on it and it ll be become level....if its back bowed though it would be a hard fix.....
    [​IMG]
     
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  15. SoulSurfer

    SoulSurfer Strat-O-Master

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    Thank you for that.
     
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  16. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    You are correct sir, very much like the top image, without strings on it.
    Already planning on finding the lowest tension strings as possible
     
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  17. Dreamdancer

    Dreamdancer Senior Stratmaster

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    There are some luthiers here that i think can chip in but in general people who build and maintain traditional instruments ll have the definitive answer cause they control an instruments bow without a rod(cause those instruments dont have one) just like your classical guitar here.....so it maybe a case of just taking the bridge and nut a bit down or refretting it to make it level or who knows what....but they do know trust me;).
     
    Last edited: Aug 18, 2021
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  18. CB91710

    CB91710 No GAS shortage here Double Platinum Supporting Member

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    #1 - Are you positive there is no truss rod? You've looked inside the body at the heel? A lot of acoustics are adjusted from the sound hole.
    #2 - Is it actual excess relief, or is is an issue of high action due to the body collapsing at the sound hole, or bellying at the bridge?
    If it is excess relief, then the sawhorse trick may work. If the neck actually looks good with a straightedge on it, then it may need a neck reset. Not cheap, you it's a nice guitar that you got for $50, so it's worth some work.
     
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  19. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    Pretty sure no truss, I have had multiple acoustics with them.
    I installed a new nut, confident that is correct
    I do need to take the bridge down at least another 1/8"
    The neck is very obviously bowed
    Top of guitar does not seem off
     
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  20. Willmunny

    Willmunny Senior Stratmaster Gold Supporting Member

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    I am at about 30 bucks including parts
     
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