Measurement hdell from fellow Furch owners

[SkipII]

I could use some precision measuring help from someone with a 14-fret Furch (I have a Red Gc, but I think they are the same across the other 14-fret models).

When I measure from the nut to the top of the 12th fret, I get 32.5 cm, but when. I measure from the top of the 12th to the front of the saddle, I get 32.7 -- meaning the string length from the 12th to the saddle is longer than from the nut to the 12th, which might explain. why I am having a hard time get intonation right (the string goes flat when fretted). This leave no room to adjust intonation on the lower strings which, because of the saddle angle, are even farther away from the 12th fret.

Thanks for any measurement help.

[JonWint]

The extra length is called "compensation".

https://www.stewmac.com/articles-and...ddlematic.html

[SkipII]

Originally Posted by JonWint

The extra length is called "compensation".

https://www.stewmac.com/articles-and...ddlematic.html

Based on that, my current saddle location is about right.

The issue is that my A sting is notably flat (15-18 cents flat) when fretted, especially at mid-neck, even. though the intonation is spot-on when checked open and 12th fret harmonic. All the other strings are about dead on along entire fretboard.

I have tried three different seats of strings, same problem.

I know about the natural variances in intonation on a stringed instrument, but this much flat and only on one string doesn't seem right. It sure doesn't sound good. I'm absolutely flummoxed on how to fix it.

[redir]

Did you check the nut?

Also, I use inches but doing the conversion, I usually go closer toe .3mm ~= .1in longer for the compensation method. With the strings off.

Did you take that measurement with the guitar strung up to standard tuning?

[charles Tauber]

Originally Posted by redir

.3mm ~= .1in

.1" = 2.54 mm

On a 650 mm (2 x 325) scale length. Typical compensation is about 2+ mm at the high E and about 4 mm at the bass E. The exact amounts depend upon string height, string type, string gauge... but, those values will be fairly close.

If this is the instrument previously discussed, other than the previous discussion regarding wolf notes, I don't have any further suggestion as to why only 5th through 7th frets would have poor intonation on only one string and only at those frets.

[redir]

Bah! I should just stick to English. .3mm =~ .01. Sorry about that.

None the less I'd still suggest making those measurements with no string tension. I doubt Furch got it wrong but it's worth a check.

[John Arnold]

String tension should make no difference in these measurements. Moving the saddle will affect intonation on all frets.

[redir]

I like to do the compensation measurement with string tension off because bridge rotation can effectively shorten the length.

[Glen DeRusha]

Originally Posted by SkipII

I could use some precision measuring help from someone with a 14-fret Furch (I have a Red Gc, but I think they are the same across the other 14-fret models).

When I measure from the nut to the top of the 12th fret, I get 32.5 cm, but when. I measure from the top of the 12th to the front of the saddle, I get 32.7 -- meaning the string length from the 12th to the saddle is longer than from the nut to the 12th, which might explain. why I am having a hard time get intonation right (the string goes flat when fretted). This leave no room to adjust intonation on the lower strings which, because of the saddle angle, are even farther away from the 12th fret.

Thanks for any measurement help.

Is that a compensated nut? Or is that the scale length that this guitar is "not" suppose to be?

What does Furch say the scale length is suppose to be on this guitar, in particular?