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Thread: Open strings out of tune with closed strings

  1. #31
    Join Date
    Oct 2012
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    Queanbeyan, NSW Australia.
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    Quote Originally Posted by botnet View Post
    I hope I did this right. basically the ruler was pressed square against the nut for the measurements.




    Attachment 106999
    ~348.5 mm



    Attachment 106998
    ~173mm




    Attachment 107000
    ~20.5mm
    This looks to be correct to me and I can't see where there would be a 17 cent sharp error. Maybe make some minor adjustments at the saddle and some minor adjustments at the nut but not to correct a 17 cent error so I'm puzzled. This is a Soprano so maybe try some new Soprano strings.

    Using a tuner can you give us an idea of how far out it is every few frets?

  2. #32
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    Quote Originally Posted by botnet View Post
    I hope I did this right.



    Attachment 107000
    ~20.5mm
    Now you say 20.5 mm but my eye says its a fraction less than 20mm.

    I ran the numbers through the Stewart MacDonald fret calculator,

    https://www.stewmac.com/FretCalculator

    I assumed a nominal scale length of 346mm which is the 173mmm from nut to centre fret x 2 and 12 frets and the calculator puts the 1st fret at 19.419mm. This looks right to my eye unless there is paralax error in the photograph.

    If it really is at 20.5mm you could shim or file it 1mm closer and you could file the saddle contact points back a little but this isn't enough to correct a 17 cent sharp error.

  3. #33
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    Sep 2016
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    Quote Originally Posted by anthonyg View Post
    This looks to be correct to me and I can't see where there would be a 17 cent sharp error. Maybe make some minor adjustments at the saddle and some minor adjustments at the nut but not to correct a 17 cent error so I'm puzzled. This is a Soprano so maybe try some new Soprano strings.

    Using a tuner can you give us an idea of how far out it is every few frets?
    I switched out the strings maybe one week ago, with Aquila carbonblack "low g" soprano strings.

    Here's the cents sharp data for each string with the matchstick removed; the tuner i'm using is Tunable for iphone:

    Fret A string E string C string G string
    1 9.5 19.5 12.4 25
    2 15.7 25.4 17.2 29.5
    3 16.4 20.9 15.5 23.4
    4 14.9 18.8 15.7 19.5
    5 10.9 10.1 15.1 19.5
    6 14.1 15.1 13.7 18.6
    7 12.2 16.3 12.6 18
    8 12.8 12.3 11.6 21.7
    9 14.7 17.5 15.2 17.5
    10 13.9 10.8 11.1 12.1
    11 6.5 19.5 9.6 4
    12 1.5 0.9 5 1

    centsSharp.jpg

    With the matchstick in place, the fretted strings are within 5 cents of the open ones.


    Lastly, a huge thanks again for helping me diagnose this.

  4. #34
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    Going by that data the nut placement is the principle culprit but I wouldn't want to move it as radically as you previously pictured. When I use the matchstick fix which I sometimes do I always have it up against the inside of the nut. Having it positioned so far away from the nut is what set off the alarm bells.

    How good or bad is the intonation if the matchstick is up against the inside of the nut?

  5. #35
    Join Date
    Nov 2017
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    Northen California
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    There is something wrong here. All the measurements are what they should be. I agree with anthonyg, the first fret shows about 19.5mm, not 20.5. The bridge is reasonably compensated at +2.5mm. There is no way that these strings should be going sharp to the degree you state. The last link in the chain is the tuner. It could be the Tunable app, but it could be in the iPhone its self. Try to get a different tuner to try. How does it sound to your ears? If it is this far off you should hear it big time.

  6. #36
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    Yep. Ditch the tuner unless it actually does sound out. If you want to mess around with nut intonation you shouldn't need to use anything thicker than 1 mm (probably less) and it should be right up against the nut. If fret and saddle position are accurately placed (which they appear to be) nut compensation should be very subtle and the amount should differ from string to string. It's a tiny difference. Don't go filing anything off that fretboard, it isn't necessary.
    Try a new set of strings, just plain nylon.

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