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Convex top?   You are logged in as Guest
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Janne H

 

Posts: 51
Joined: Sep. 19 2010
From: Sweden

Convex top? 
Hi, a newbie lutherie question.

Does a flamenco/classical guitar need to have a convex top/back?

Any pros or cons?

Janne
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 9 2011 18:53:05
 
Janne H

 

Posts: 51
Joined: Sep. 19 2010
From: Sweden

RE: Convex top? (in reply to Janne H) 
I meant when bracing the top(or back) to use a carved workboard or not.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 10 2011 8:28:46
 
Jeff Highland

 

Posts: 401
Joined: Mar. 5 2010
From: Caves Beach Australia

RE: Convex top? (in reply to Janne H) 
With the back, doming it has a couple of advantages including.
-It offers some protection against cracking in dry weather in that that the dome will reduce first before the wood is stressed.
-A truly flat back looks concave to the eye.
I cannot thing of any disadvantages

-As far as the doming to the top, most makers use a dome, generally a lesser one for Flamencos, but some build flat or just with a drop off towards the tail.
Whatever you do it is important to make the neck angle work with the amount of doming you use.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 10 2011 21:11:41
 
Janne H

 

Posts: 51
Joined: Sep. 19 2010
From: Sweden

RE: Convex top? (in reply to Jeff Highland) 
Thanks, interesting.

I was watching the Robert O´brian DVD (building a classical guitar) and he uses some doming on the top and back, but if I remember correctly he didn´t mention anything about compensating the neck angle, just that it should have a 90 degree angle to the sides, straight with the top. I´ll have to recheck.
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 10 2011 21:34:53
 
Anders Eliasson

Posts: 5780
Joined: Oct. 18 2006
 

RE: Convex top? (in reply to Janne H) 
I dome the back and brace the top flat

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Blog: http://news-from-the-workshop.blogspot.com/
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 11 2011 7:18:43
 
Stephen Eden

 

Posts: 914
Joined: Apr. 12 2008
From: UK

RE: Convex top? (in reply to Janne H) 
I dome both back and top. Not the same doming. It is something every builder has there own opinions about. I know some builders who use a greater doming for flamenco guitars than there classical. always something to the contrary.

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Classical and Flamenco Guitars www.EdenGuitars.co.uk
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 11 2011 9:53:27
 
Anders Eliasson

Posts: 5780
Joined: Oct. 18 2006
 

RE: Convex top? (in reply to Stephen Eden) 
quote:

always something to the contrary.


Thats a thing I really like about building guitars. There doesnt seem to be a fixed logical way. You have to find your own way if you want to build good guitars.

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Blog: http://news-from-the-workshop.blogspot.com/
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 11 2011 18:04:33
 
krichards

Posts: 597
Joined: Jan. 14 2007
From: York, England

RE: Convex top? (in reply to Anders Eliasson) 
quote:

I dome the back and brace the top flat


Flat top?
Didn't you use a domed solera in the Guittarero DVD?
Have you changed since then?

Can you tell us why?

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Kevin Richards

http://www.facebook.com/#!/kevin.richards.1048554
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 12 2011 15:34:39
 
Anders Eliasson

Posts: 5780
Joined: Oct. 18 2006
 

RE: Convex top? (in reply to Janne H) 
I have changed since the DVD (its 5 - 6years ago!!!)

I changed because I like it better.

The end result is a top with 1,5 - 2mm dome.

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Blog: http://news-from-the-workshop.blogspot.com/
  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 12 2011 16:43:10
 
Armando

Posts: 302
Joined: May 27 2005
From: Zürich, Switzerland

RE: Convex top? (in reply to Janne H) 
I made bad experiences with domed tops, but very good ones with flat tops on flamenco guitars. I think i'll continue to build with slighly domed back and flat top.

regards

Armando

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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 12 2011 18:40:46
 
El Burdo

 

Posts: 632
Joined: Sep. 8 2011
 

RE: Convex top? (in reply to Armando) 
Just watched Simon's video (both sections) where Anders makes his guitar.

I don't know if Anders is still on the foro to ask, but can I ask, if you brace the top flat do you get the eventual dome by curving the bridge so the top is under permanent tension? I guess the harmonic bars are also flat? Thanks.
  REPORT THIS POST AS INAPPROPRIATE |  Date Sep. 15 2018 9:29:33
 
JasonM

Posts: 2051
Joined: Dec. 8 2005
From: Baltimore

RE: Convex top? (in reply to El Burdo) 
Hes mentioned this in a couple of post but I can only remember this one:

http://www.foroflamenco.com/tm.asp?m=209908&mpage=2&p=&tmode=1&smode=1&key=

Basically he gets a dome by the bridge strap curving and possibly a curved bridge caul. I also remember him saying that he no longer builds quite the same as in the documentary. Probably because it was a fake documentary ;)
  REPORT THIS POST AS INAPPROPRIATE |  Date Sep. 15 2018 16:42:51
 
El Burdo

 

Posts: 632
Joined: Sep. 8 2011
 

RE: Convex top? (in reply to Janne H) 
Hi Jason - thanks - but 'When bracing flat, this strap raises the soundboard some 2mm on the finished guitar'. That strap has to be under some tension (if it's only a mm think) to deform the top 2mm. Maybe it's the gluing..(under tension)?
  REPORT THIS POST AS INAPPROPRIATE |  Date Sep. 15 2018 22:23:03
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