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Ahmed Flamenco

 

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

Back and sides are twisted 

Hello everyone I'm in a trouble a back and sides for a new coming guitar are twisted.
Is there anything I can do?





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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 18 2017 19:26:02
 
estebanana

Posts: 8324
Joined: Oct. 16 2009
 

RE: Back and sides are twisted (in reply to Ahmed Flamenco

Too much moisture bending the ribs. The waves don't look too bad however. If ribs are thick enough you can sand that out with a hard flat sanding block right before you cut the binding channel.

If the ribs are already really thin and unassembled- You can create a laminating jig shaped like a rib and glue thin maple veneer to the inside of the rib to give it more thickness then carefully sand out the waves.

Or leave the waves. In cello making some makers would simply go with that because it's part of the game and it look natural. Guitar making has it's priorities in the wrong place on stuff like that.

Another option is to glue cloth tape to the inside of the rib for extra strength. A common practice in steel string construction.

Buyers will question it, so I recommend fixing it. But in the bigger picture guitar making suffers from boring flat planes, but only a minority of viewers think that is true.


If you need help with any of those solutions let us know.
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You have to plane the braces off the back, clean the glue residue, make new braces and reglue them.

Make sure the braces are strong wood. Arch them carefully. and most important check your glue up area to make sure the room is dry. Under 50% relative humidity.

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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 19 2017 3:39:34
 
Anders Eliasson

Posts: 5780
Joined: Oct. 18 2006
 

RE: Back and sides are twisted (in reply to Ahmed Flamenco

The back has most probably bent because you have glued the braces in humid conditions and now its a lot dryer.
Controlling humidity is extremely important when building wooden instruments.

I agree with Stephen on his views on the sides. I call it bubble up. In violin building it happens a lot because the sides are only 1mm thick and you have to use a certain amount of moist to bend the highly figured maple. So the "window" is very narrow. You can easily bend to dry and scorch and not get the right shape or bend to wet and get bubble up or even see the highly figured cook into pieces (fall apart)
Cypress like yours need very little moist. The problem with bending cypress is that if they get to hot, they lock and wont bend at all and then you have to wait a while and continue the bending

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  REPORT THIS POST AS INAPPROPRIATE |  Date Apr. 19 2017 14:43:40
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