estebanana -> RE: guitar action ajustment (Dec. 29 2017 0:10:54)
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On second thought, if you have 5 mm and 6 mm, and under three at the 12th, just make a 1 mm thick shim and put it under the saddle. If you raise a saddle from that low over the top to 7 mm you're not going to change the set up drastically, you'll probably be right around 3 mm at the 12th which is normal. The very worst thing that can happen to you is that the guitar will play cleaner. If that does not make you happy, try another half mm of shim. 7.5 bass and 6.5 treble is lowish on a normal set up, and probably about as low as most set up works. If you were at 9 mm over the top and wanted to go higher, then you will begin to mess with the overtone activation a start jacking up the sound by activating too much. As far as break angle, it's an interesting topic, generally the consensus today is that you want at least 11 degrees, but as little as 6 will work. This is based on some testing carried out by Al Carruth - and it's empirical in so far as the tests were evaluated by players who tested the guitars blindly. There has been some builder/ engineers who dialed up the 11 degrees number also. There was also some testing coming out of Carruth's shop that said hyper angled break over the saddle has quick diminishing returns on performance. In other words and 45 degree or a 30 degree break angle is not buying you much more sound than a 15 degree angle. That said and your question about break angle providing you more sound or 'Ummph', if you already have anything around 10 degrees you're probably fine. Adding a 1 mm tall shim won't really change the guitar in a dangerous way, or intensify the so called torque, you are pretty much bottomed out, so the question I would ask is what is your threshold of comfort at the 12th fret? And then to take that farther, some players feel every guitar they have should have exactly the same set up at the 12th fret, I'd caution against accepting this as the right thing to do. One guitar might work well with the string under three at the 12th and another might not. But since you're guitar is pretty much bottomed out and you have a lot of headroom for higher adjustment, I'd experiment with shims and not worry about 'torque' or the 12th fret height at first. Take a ruler and razor blade and make a shim, and after that experiment if you are locked into under 3 mm at the 12th fret, then take it to someone like Alan Perlman or Stew. If you like the shimmed up saddle have one of them make you a new saddle at that height.
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