Bowing in on 12-20th fret

Discussion in 'Hardware, Setup & Repair [BG]' started by ThePoloHobo, Mar 26, 2014.

  1. ThePoloHobo


    Aug 18, 2013
    Tulsa, OK
    So I got a 2012ish MiM Jazz, and I'm trying to get a decent action on it, but from the 12th fret up, the neck curves out (like a "ski ramp" at the end of the fretboard). From 1-12 the neck is pretty straight though.. Is there any way I can adjust to work around this problem? Or perhaps fix it? :help:
  2. deeptubes


    Feb 21, 2011
    Have you tried slackening the strings and completely loosening the truss' nut?
  3. ThePoloHobo


    Aug 18, 2013
    Tulsa, OK
    That's actually how I got the rest of the neck straight, but I only let it hang overnight. This thing was bowed pretty badly. However, I'm not sure if I got the truss rod 'completely' loose.
  4. deeptubes


    Feb 21, 2011
  5. elBandito


    Dec 3, 2008
    Rotten Apple
    Not surprising on a MIM neck. Depending on how bad the ski jump is, fret level and fall away could remedy it.
  6. JLS


    Sep 12, 2008
    Emeryville, Ca
    I setup & repair guitars & basses
    ^^^^^ Yup!

    All the truss twistin' in the world, ain't gonna fix a ski jump.

    Recently, I came upon a method to get significant fallaway, *if* there's enough fret height to lose; it's similar to, "flossing", the heel of an acoustic guitar, when doing a neck reset.
    Under each string's, "lie", I use one of my u-channel leveling tools, about 7" long, so it bridges from the last fret, back to F14-15, which is usually where the ski jump starts. I firmly dress these frets, going in one direction only, towards the bridge. This ensures that the frets closer to the end of the fingerboard, have more material removed, very obvious when using this method. Recrown & polish, good to go.

    I have a couple of dial indicator based tools, one set to measure relief at F7, another set to measure ski jump masquerading as relief, at the midpoint between F12/14, and the last fret. The amount of faux relief measured by the latter tool, is how much needs to be removed form the last fret, just to make this are dead level--I add 10-20 thou, get get the fret fallaway. I've been just dee-lighted with this method1
    The caveats are: can't have more faux relief than you can remove by removing fret metal; when ski jump is bad, it's partial/full refret time.

    I'll post pics of this, sometime, but I'm in the middle (well, endgame)of moving.
  7. Lizarddan


    Mar 28, 2014
    Did you check this against the neck itself with a notched straight edge, with a regular straight edge, or is it severe enough to be able to eyeball it?