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Santos Hernandez design question?   You are logged in as Guest
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Ahmed Flamenco

 

Posts: 163
Joined: Feb. 22 2014
From: Egypt

Santos Hernandez design question? 
I'm using Santos Hernandez design and I don't know whether to make the top 2 or 3 mm also the braces in the design has height of 3.5 mm, is this sufficient or what?!
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 22 2014 16:30:20
 
Andy Culpepper

Posts: 3023
Joined: Mar. 30 2009
From: NY, USA

RE: Santos Hernandez design question? (in reply to Ahmed Flamenco) 
quote:

I'm using Santos Hernandez design and I don't know whether to make the top 2 or 3 mm


There's a huuuuge difference between 2 and 3 mm... remember that stiffness goes up as a cube of thickness, so 50% thicker is 200% stiffer.

The question should be more like 2.1 or 2.2 mm in the center, but it depends on a lot of things like doming, bracing etc. 3.5 mm braces are fine in the right overall design.

The question of how thick to make the particular piece of top wood you are using is one of many that simply can't be answered by a plan. As a first build I would recommend to make everything a little stiffer/thicker than you think and then string it up without finish. Then you can experiment with sanding the top gradually, adjusting braces from the inside, even scraping/sanding the back down and hear how the sound changes as you go.

There are many things in guitar making that can only be learned through experience and making many guitars.

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Andy Culpepper, luthier
http://www.andyculpepper.com
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 22 2014 16:57:59
 
Tom Blackshear

 

Posts: 2304
Joined: Apr. 15 2008
 

RE: Santos Hernandez design question? (in reply to Andy Culpepper) 
I have checked out my share of Santos guitars and they were from 1.8 MM to 2.5 MM......But like Andy says; start with the top a little thicker and then find the right balance by sanding, if necessary.....

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Tom Blackshear Guitar maker
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 22 2014 17:40:04
 
Ahmed Flamenco

 

Posts: 163
Joined: Feb. 22 2014
From: Egypt

RE: Santos Hernandez design question? (in reply to Andy Culpepper) 
I'm thankful and grateful Andy, and yes of course there are many things in guitar making that can only be learned through experience and making many guitars, so it is not supposed to be awesome from the first time, I hope to meet you one day if I came to make my graduate studies in USA.
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 22 2014 18:50:19
 
Anders Eliasson

Posts: 5780
Joined: Oct. 18 2006
 

RE: Santos Hernandez design question? (in reply to Andy Culpepper) 
quote:


The question should be more like 2.1 or 2.2 mm in the center, but it depends on a lot of things like doming, bracing etc. 3.5 mm braces are fine in the right overall design.



Its 100% impossible to say anything about the correct thickness without having the actual pice of wood in your hands. It can be whatever between 1.9 and 2.6, so your 2.1 - 2.2 may be right but it can also be wrong.
Using thickness as a guide to soundboard thickness is not very usefull.
Spruce for instrument making can be sooo different. Some spruce is are close to cedar and some is very close to Sitka spruce. Even spruce cut from the same valley can have huge difference.
But of course, if the original poster has absolutely no physical reference, then its better to do 2.2 than to do 3mm. Chances that he will get it right are bigger, but it is not based on any kind of fact. Is pure guessing.

If the soundboard thickness is right then 3.5 v shaped braces should be correct, again depending on the stiffness and weight of the bracing stock.

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  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 23 2014 7:56:18
 
Andy Culpepper

Posts: 3023
Joined: Mar. 30 2009
From: NY, USA

RE: Santos Hernandez design question? (in reply to Anders Eliasson) 
quote:

so your 2.1 - 2.2 may be right but it can also be wrong.


Anders makes some great points that I totally agree with. I just meant that that would be "closer" to the right kind of question to ask.

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Andy Culpepper, luthier
http://www.andyculpepper.com
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 23 2014 11:28:57
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