***The Official Guitar Thread***

Slowly coming along...
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Having rheumatoid arthritis really puts a dampener on playing guitar. Bought new strings and fret board oil 2 weeks ago, to give both acoustics a spruce up, but still haven't got around to it.
 
So I mapped the guitar completely after the refretting:
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Left shows the fret measured error to the 0.1mm, it will always be an incremental. The right shows the frequency error in cent to 0.1Hz accuracy.

It's important to take this as a rough rule of thumb because the error shows a couple of things:
* The temperament does what it should do - have a ramp up, typically this will be negative before about the 5th or 7th fret and positive after. A nut move will shift this.
* There is some intonation that is needed which should help reduce some of the frequency error
* The nut needs bringing forward about 1.5mm or so, then re-intonating.

A cleaner way is to look at the error per fret based on accumulation of the strings:
Hl3UPFf.png


This shows that (colours of strings vary from the upper two graphs):
a) given some adjustment globally (ie the nut) that the general total error of each fret should be reduced.
b) oddities at frets 15 and 24 which indicate there's some funky business going on.
c) the colours indicate that the G and D strings are a little out, probably needing some nut tuning.

Edit:

So I’ve tuned at 2ns fret and rechecked the error and it reduces the error.

To test my idea of the nut change I put a hex key and it makes a hell of a difference in reducing the errors. Only the B and G strings need intonation.

I’ll retest with thr key tomorrow to check the error but the tuner seemed to think it was bang on (except B and G).

So it looks like a little nut adjustment in the next couple of days
 
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So I've refitted the nut and as you can see there's a bit of a high action at the moment, this causes the string to bend and go sharp - this is why you see all the large rise.
CNEJKd4.png


The errors on the upper frets go sharp a little too much.

The diagonal slope is simply what you seer from equal temperament (ie 12 notes per octave). All equal temperament guitars have this slope, mine is a little more emphasised due to the jumbo frets and the lack of finessing :)

Now after intonation.. guess which string I intonated:
uB0I9mt.png


Edit: I did continue and the graph is looking good.
There diagonal can also be helped by putting in some neck relief once I have the nut height sorted.
 
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