agentsvr

This is the first guitar a friend of mine made. He doesn't know a thing about guitars and i am trying to help him correct some mistakes. (Some of them i noticed already but would like to hear your opinions...)

Thank you Jehle. That should be what i need :-) I'm sorry the mess up with the namings but in portuguese we use diferent names... you can forget about the other questions since it seems this forum is only about electrical instruments...

I have a friend that works very well on wood (he's professional). I gave him an idea to make a guitar and he did (it's a stell acustic guitar). The box, arm (and reinforcement), type of wood, etc seems very very good, but... Trying to tune his guitar i realise that he didn't got the distances right. (He says the guitar is tuned great, but i know it isn't, unless you play loose strings) I was wondering what is the mathematical formula for the 12 temperated tunes? I know i must have that somewhere but if you could help me with the distances it would be very much appreciated. Also, i know that to get ressonancy each builder puts inside the box various strips in each one personal style. Some open more holes in the box, etc.. I was wondering if someone could help me with those too... Also is there a "good" minimal height for the distance between the string and the arm (so it won't hit against the arm and make silly noise)? thank you, David