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Calculating the length of my rod

Discussion in 'Tele Home Depot' started by tarbie, Apr 23, 2012.

  1. tarbie

    tarbie TDPRI Member

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    Hi all. I'm planning on building a miniature bass not unlike the 'minibass' thread which was on here a little while ago and I'm wondering what length of rod to use on the neck. The scale length I was planning on was about 18-20'' depending on what length rods I can get.
    using the Stewmac fret combobulator it tells me that, if my scale length is 18'' then a 22 fret neck would have a fretboard length about 13''.
    I can get a classical guitar rod which is about 12 1/4'' which doesn't seem far off.
    I'll obviously be getting some more accurate measurements before I get anything but this post is really just to give you a picture of what I'm trying to do and to see if anyone's got any thoughts on what I should be thinking about when deciding on scale length/rod length/neck length etc.
    I'm assuming there's a bit of leeway with the length of rod you can use since, for example, Fender and Gibson's scale lengths are different but you could presumably stick the same rod in either, so does anyone have any of your usual helpfil and very valued advice?
    Thanks.
     
  2. fretman_2

    fretman_2 Friend of Leo's

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    This thread will be worth watching just for the jokes alone! I hope you can get a "straight" answer from these guys.
     
  3. pdxjoel

    pdxjoel Tele-Holic

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    Getting hard numbers will be tough. Let's see how long it will take for this member's thread to get sacked.

    Ok...I'm done.
     
  4. Colt W. Knight

    Colt W. Knight Doctor of Teleocity Ad Free Member

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    When you decide what length you need, LMI will makes rods to whatever length you want. I would simply cross multiply to get a simple ratio to determine your truss rod length.

    (Truss Rod Length/Scale Length)=(Truss Rod Length/Scale Length)

    (18" Truss Rod/ 25.5" Scale) = ( Unknown Truss Rod Length(X)/18" Scale)

    (18" Truss Rod * 18" Scale) = ( 25.5" Scale * X)

    (324 TRSc) = 25.5ScX

    (324TRSc/25.5Sc) = X

    X = 12.71TR

    I don't see any reason a 12.25" rod wouldn't work.
     
  5. waparker4

    waparker4 Doctor of Teleocity Ad Free Member

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    12.25" ? That is a monster rod.
     
  6. Warnz

    Warnz Tele-Meister

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    Don't forget that for a given diameter, stiffness is proportional to length ;)
     
  7. K-Bru

    K-Bru TDPRI Member

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    I'm sorry, I know it's sad but I can't stop laughing at the title of this post.

    As an aside, I thought for sure I had been using a 10" rod but my wife swears it's only 5 1/4".
     
  8. ADinNYC

    ADinNYC Friend of Leo's Platinum Supporter

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    Keep in mind that you'll get different readings depending on the current temperature. Colder temps often result in shrinkage and you won't get a true measurement.
     
  9. guitarzan13

    guitarzan13 Friend of Leo's

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    :lol:
     
  10. fezz parka

    fezz parka ---------------------------

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    Measure from the pubic bone, not the perineum.
     
  11. 63dot

    63dot Friend of Leo's

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    For honest math, we can get most done with this:
     

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  12. tjalla

    tjalla Friend of Leo's

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    There's circumnavigating something. Then there's Fezz :lol:
     
  13. coolpool

    coolpool Tele-Meister

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    Now should the rod stand proud while measuring?
    Seriously, go with Colt's advice
     
  14. Manolete

    Manolete Friend of Leo's

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    [​IMG]
     
  15. nosmo

    nosmo Friend of Leo's

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    Yes, but if you stick your Fender rod in a Gibson, you risk loosing your Fender.
     
  16. tarbie

    tarbie TDPRI Member

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    Has anyone ever asked the mods to remove one of their own threads: )
    Thanks for the good advice everyone (particularly Colt).
    Now I just need to decide whether to insert it from the front or the back...:D
     
  17. Colt W. Knight

    Colt W. Knight Doctor of Teleocity Ad Free Member

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    I kept my cool on this thread till I read that. Then I about spit milk out my nose.
     
  18. nosmo

    nosmo Friend of Leo's

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    Seriously, I just built a short scale bass - 30" scale. the neck was too short for a bass TR and a little long for a guitar TR. I wanted to use a 2 way TR from Stew-Mac, so I just bought the 18" and installed it with the adjustment at the heel. It may be shorter than it should be, but it works very well. I tend to overthink things, but for this one I played the ignorance card.
     
  19. bcarter_1

    bcarter_1 Tele-Afflicted

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  20. Northerntele

    Northerntele Tele-Holic

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    Just remember, the big ones are inches :D
     
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