Hi iam new to building cbg when using a bolt for the nut where do you measure from is the centre of the bolt or the front when working out the scale length

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Andre, the scale length when using a bolt will start from the centre,[the last contact point of the string] 

Thanks

center of  nut bolt  . to center of bridge  bolt  .  and the 12th fret should end up  at  half  that measurement .

Thanks for the help
Yep, and from the centre of any fret. Don't forget to add the required amount of compensation at the bridge/saddle, to allow for correct intonation due to string height and diameter differences.
Cheers Taff
What amount do you allow for compensation at the bridge

That will vary quite a bit depending on scale length/ string gauge/ height of action etc, with a bolt as a bridge, you really only have string length compensation easy to effect, and will probably end up being a little bit of compromise by intonating top and bottom strings, and those in between being very close but not perfect, there are many posts re intonation, some very basic, and some quite complex, for a 1st build, i'd go simple and tune the top,[thinnest] string so you get the desired note at open and 1 octave higher at the 12th fret, this should be with the scale length double the distance from nut to fret 12, then doing the same with your bottom, [thickest] string, which will most likely mean angling the bridge toward the tail a little for that string, any in between strings should be very close, but maybe not perfect

Thanks for the advice will have a go
Hi again, if the fretted note at the 12 fret is higher than the harmonic note at the 12th, then move the saddle back, this will lower the strings pitch. Tune up the string to pitch and repeat the test until harmonic is same as fretted note. String notes too low move saddle forwards.
Cheers Taff
Ok Will do that thanks again

For example / reference, using acoustic light gauge strings tuned DGBE on 24 3/4" scale, I generally compensate approximately 1/8" (longer, toward tailpiece) on the bass D string and half that for the treble E. Using a tuner and repositioning the bridge as needed, of course gets you dialed in really good for your specific set-up.

Hi as it's my first time building one i am going to just make a slide guitar with a 25in scale

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