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devincox
 Post subject: repairing cracks
PostPosted: Fri Jun 10, 2011 12:53 pm 
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Mahogany
Mahogany

Joined: Thu Jul 23, 2009 4:54 pm
Posts: 96
First name: Devin
Last Name: Cox
City: Edmond
State: Oklahoma
Country: usa
Focus: Build
Status: Amateur
I have some large cracks in the back of a guitar I'm repairing. I have repaired cracks before, but these are raised and spreading apart. The cracks are about 1/8" proud of the surface. How do I go about getting that flat again?

Image


thanks,
Devin
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mcgr40
 Post subject: Re: repairing cracks
PostPosted: Fri Jun 10, 2011 1:54 pm 
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Cocobolo
Cocobolo

Joined: Sat Jul 11, 2009 10:06 am
Posts: 179
First name: mike
Last Name: mcgrail
State: ky
Country: usa
Focus: Build
Status: Amateur
Is that a pc of mahogany that is very flatsawn? maybe i am looking at it wrong.
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devincox
 Post subject: Re: repairing cracks
PostPosted: Fri Jun 10, 2011 4:37 pm 
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Mahogany
Mahogany

Joined: Thu Jul 23, 2009 4:54 pm
Posts: 96
First name: Devin
Last Name: Cox
City: Edmond
State: Oklahoma
Country: usa
Focus: Build
Status: Amateur
It's the Mahogany back from my guild m20, I didnt really look to see if it was flatsawn or not.

Devin
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unkabob
 Post subject: Re: repairing cracks
PostPosted: Fri Jun 10, 2011 11:25 pm 
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Koa
Koa

Joined: Sat Nov 07, 2009 9:34 pm
Posts: 552
City: winnipeg
State: manitoba
Country: canada
Focus: Build
Status: Amateur
I flattened an old birch guitar top using an iron and ironing it flat under aluminum foil with a spritz of water. Clamp it between two flat boards overnight as it cools.

Just an idea.

Bob :ugeek:
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David Newton
 Post subject: Re: repairing cracks
PostPosted: Fri Jun 10, 2011 11:39 pm 
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Koa
Koa
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Joined: Tue Oct 30, 2007 9:13 am
Posts: 1167
Location: United States
State: Texas
Focus: Repair
Status: Professional
You need to remove the braces and rehydrate and clamp the back between boards, I don't think heat will do any good, but that's just my opinion.
When the wood is back to it's shape, then glue the joint, an re-brace.
Treat it just like a new back that you are going to join and brace. If the wood won't return to it's original shape, and it may not, you'll have to fit some splints to the gaps, before bracing.

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