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PostPosted: Tue Jan 08, 2013 8:27 pm 
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Koa
Koa

Joined: Sat Mar 01, 2008 2:44 pm
Posts: 692
Jeff, I don't have enough adjustment on the saddles to do the full 20 cents. The saddles are barrel type that I ground so as to have a definite break point. It's just a cheap electric guitar saddle that I modified, I guess I could get longer screws to do 20 cents.... I built the rig so I could get accurate intonation for various scale lengths with nut compensation.

Chuck

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PostPosted: Tue Jan 08, 2013 9:07 pm 
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Koa
Koa

Joined: Wed Aug 22, 2007 11:58 am
Posts: 1667
Should be Exactly the same result regardless of string guage because you are NOT in this case measuring the amount of compensation required in addition to scale length.

No sir, a stiffer string should, with all other variables remaining constant, still need more compensation. As the results proved. That's why something as simple as changing string brands can often lead to complaints about intonation; various brands will have different wrap to core ratios, giving the strings different slightly different intonation requirements, despite the gauge being the same. Typically not a big deal on acoustic guitars, but get an electric guy who runs a lot of reverb or has fussy ears, and it will drive him to your door in a hurry.

Doesn't matter if the saddles in this rig are barrels or not, as in this case he's measuring the movement of the whole saddle, not the contact point. Chuck, if you know the thread count for the saddle adjustment screws, you could determine the exact distance changes just by counting the turns it takes. For example, a 10-32(32 tpi) screw would mean 32 turns to move it an inch, or, 1/32" per full turn, 1/64" per half turn, 1/128" per quarter turn, etc... Might be worth determining what the thread count is and making a note of it for future reference, as it will make tests very quickly and extremely precise.

Oh, and thanks for running the tests, Chuck!


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PostPosted: Tue Jan 08, 2013 10:12 pm 
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Koa
Koa

Joined: Thu Jan 24, 2008 2:13 am
Posts: 902
Location: Caves Beach, Australia
Yes sir,
It will be independent of those other factors because they have already been taken care of in the initial measurement

A stiffer heavier string will obviously need more compensation, but not then more adjustment per cent change.

Regarding Chucks Jig. I just question whether the figure in the thousands of an inch would be significant given the difficulty in accurately measuring these small movements.

This is one situation where theory and test do line up very closely.


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