A while back I bought a Delta Grooves neck because, new to guitar building, I wanted to see how nice a neck could be. I finally put this into a nice Tabak box. Humbucker pickups, enclosed tuners, hardtail bridge.
The intonation is so whacked I gotta move the bridge back further. The sustain on this neck is beautiful. The humbucker is warm and gnarly with gain applied. As soon as I get the intonation fixed, I'll put a sound bite up!
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I think I might try filing the slots some more...
just had a re think Richard, another, and more likely culprit might be the nut being too high, that fits your problem well as well, as all played from the nut will be a little bit higher pitch, whereas if the nut edge is further towards the tuners, they will be lower pitch to get open tuning, but sharpen when fretted
Yup. I thought so from your first photo.
Your distance from nut to first seems too long.
You can fix this and there's a mathematical way to do it. I think.. And because it's 5 am here (I can't sleep tonight) better get a second opinion here from one of the guys..
Measure the distance from the first fret to the 13th fret (in mm). Double it. (This will also give you the correct distance away from the first fret to your bridge). Take that number and divide it by 0.9438743127. This should give you the position of the nut.
You can check it out by putting a small nail at this measurement, not much higher than the size of your frets. This will act like a movable zero fret. See how it effects intonation BEFORE you make any changes to the guitar.
It looks like the distance from nut to 1st fret is correct: 1.431.
I removed the nut and sanded down the bottom edge some and now it's very close to proper intonation. I'll do a little more sanding...
Just a thought, but if everything is good except the nut location, could you move it to make things right? A shim at the end of fretboard would move it back, or a bit of filing on the end of the fretboard would move it forward. Hopefully the former as it is much less permanent!
The box knife did a good job!
I marked the nut, removed it, measured distance from bottom of nut to the line, transposed the measurement, and started sanding the bottom edge. Once I got fairly close, I slipped the nut into place. Intonation is almost correct. The screws on the hardtail are still screwed in as far as possible (springs are totally compressed) though....
Screws on hardtail fully compressed. Sure would be nice if I could back those screws off a bit!
I had to do that with the last one of those bridges I used. I had to stick a plastic piece under the height screws on the low string. It buzzed once I got it pulled way back. Those screws are behind their little troughs, and at a steep angle. I used one of those little plastic things that attach tags to clothes.
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