I used the the Bridge ailment tool from beard to get my my bridge in to proper place to set up my dobro. I have it in tune and the chimes at the 12th fret are spot on but when I place my bar for the 12th fret nots there flat? Almost a 1/4in until it comes up perfect on the tuner. What should I do? The nut to the 12ft fret is 12 1/2 in and from the 12th fret to the bridge is 12 1/2 in the setup should be perfect from what I understand for a 25in scale.
Was the intonation correct before you made adjustments?
If so, just readjust and don't worry about it.
Does the tendency to go flat happen on all strings or just several? Are you tuning "straight up" 440 or like many of us, temper the tuning?
@hlpdobro It was happing before that's why I tried setting it up. For testing I tuned all strings 440 to GBDGBD no tempering. Its flat on all strings not as bad on the wound G string.
OK..What guitar and spider? Measuring from the point of contact (strings to nut and strings to insert)?
If the strings are new and if your bar placement is accurate then I'd need to have the guitar on my bench to see exactly how the guitar is responding.
Edited by - hlpdobro on 08/02/2022 18:24:17
@hldobro The guitar was made by Tom Warner and it has beard inside spider and cone and inserts. The strings height at the nut is 1/2 and the same at the cover plate in front of the bridge. One question I have would the harmonics be spot on at the 12th fret if the bridge was in the wrong place?
When the guitar's in tune, make felt-pen dots at the 12 1/2"spot, then check again with harmonics and bar, recognizing that the curve of your bar meets the string at the center line of the bar. Unless I'm missing something, what you're describing sounds physically impossible, but then I'm often missing something...
I would agree that my initial thought was bar placement, all else being equal.
The only other question I have is if the 12th fret is positioned exactly on the edge of the body?
But...Without the guitar, I withhold judgement.
Edited by - hlpdobro on 08/03/2022 07:36:47
@badger @hlpdobro Thanks guy for your help. Badger I had always thought that the leading edge of the bar straight over the fret was proper placement to get the perfect note. I turned the bar sideways and tipped it up and just had the leading edge of it straight over the 12th fret and it was spot on with the tuner. Its going to take some relearning but from this test I need to have the leading edge of the bar well past the fret to get the proper note. Looking at my bar its like a 1/4 in from the the leading edge to the middle of the bar. Am I understanding all this the right way?
Since the bottom of your bar is curved, the leading edge (as you visualize it) is off the strings, unless you are leaning it severely. Consider where the bar actually touches the strings....that is usually the center of the bar and that is where the note will be intonated.
When the bar is properly positioned you'll not actually be able to see the fret.
Edited by - hlpdobro on 08/03/2022 14:26:24
but do note that the visual alignment will differ depending on what fret...you will see the lower frets easily when playing in tune, but not the upper ones, due to parallax - the angle at which you are looking at the bar and fret, which are at different heights...
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