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Rob, I built an EVH cbg that looks a lot like yours.
Hi Rob did you get the intonation sorted, if so what was the fix? I'd love to know.
Cheers Taff
Yeah. Capo the 1st and test the harmonic at the 13th. (Lightly touch and lift off just after plucking it) it should be very close to the fretted 13th note.
This is actually the best way to get the intonation set at the bridge because it eliminates any nut discrepancies. Also remember that every straight fret system (including fender and Gibson's) they are all 'not perfect'. If you can get the guitar sounding good with a capo, then the problem is at the nut.
If this works good, then set the intonation for the thinnest string with the capo on fret 1. (Using the harmonic at fret 13 and the note at 13)
Measure the distance from this bridge position to the first fret (in mm) and divide it by 0.94387. This will give you the length your string should be. I.E. the leading edge of the nut.
All this is reverse maths. When I build a guitar I don't worry muh about scale length. I get it all together, mark where I want my nut to be, mark where I want my bridge to be and multiply that length by 0.9438743127 for each fret. As long as you clamp your measuring tape and double check, your good to go. When you understand this method it makes checking nut spacings and harmonics etc fall into place. You begin to understand what your doing to the wood based on the viration lengths of the strings.
Your string height may be too high and when the strings are pressed down they go sharp. Also check the scale (nut to Bridge) .
From seeing the photos, your string height is way (and I mean maybe by a factor of 4 or 5 times) too high to have any hope of intonating decently. At the 12th fret you should be shooting for 2-3mm (1/8 inch max) if you want to play it using the frets. With the correct string tension this isn't too low for slide playing either, around that mark should give you a happy medium.
With your bridge set-up it just isn't possible to lower it enough to make any meaningful improvement. It looks as though the neck is set in too low and possibly pitched forward - that's your problem. You need to take the neck out and give it some back angle, and/or re-fix it so that the fretboard is higher with respect to the top of the box. If you've glued the neck in, then I'd say leave it alone, move on and make another one, just fix it with screws next time. Every one of my guitars is fixed with screws through the back of the box - it means you can tinker with the action and repair them easily.
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