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PostPosted: Fri Sep 11, 2009 11:01 pm 
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Joined: Sat Nov 26, 2005 7:32 pm
Posts: 1969
Location: United States
george wilson wrote:
..........The purpose of the cross strips isn't really to PREVENT cracks. They can't,unless you want to cover the sides with 100% coverage,turning them into plywood...............

Hey - That sounds like a good idea! Below is a picture of one of my latest builds with ply sides. I epoxy veneer, in this case koa, to the sides with the grain running perpendicular. I don't believe these sides will split any time soon. The stiffness is vastly improved. This is part of my methodology of building thin tops - I want the sides to be very supportive.

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PostPosted: Tue Sep 15, 2009 1:28 pm 
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Cocobolo
Cocobolo

Joined: Mon May 19, 2008 12:05 pm
Posts: 127
Location: Coventry, UK
First name: Jonathan
Last Name: Jones
City: Nuneaton
Focus: Build
Status: Amateur
I don't mean to resurrect this thread, but has anyone read the new acoustic guitar magazine?

there is a repair article on a 1941 d-18, the relevant bit was a crack, along the grain, that ran from the tail to head block (near enough), down the whole bass rib. the cloth and glue side reinforcement had done nothing, as they too had also cracked cleanly in exactly the same manner.

i realise that this guitar is the best part of 70 years old, and the cause of this trauma (and the age) was unknown (though there was quite a bit of cross grain damage by the tail block indicating that there was an impact there),

could wood fail like this? is there anything that one could do to help extend the durability of the reinforcements?

thanks

Jonny

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PostPosted: Tue Sep 15, 2009 11:32 pm 
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Koa
Koa

Joined: Sun Jan 02, 2005 1:38 pm
Posts: 1106
Location: Amherst, NH USA
Focus: Build
Status: Amateur
Al Carruth braced up a bunch of sides with different supports, including wood and several different methods gluing different types of cloth supports. He then cracked them. His results showed the best crack stopping from cotton/poly biased tape from the fabric store glued on with hide glue and (I think) sealed with shellac. I've switched to doing this and find it easier to do than in letting wood into the linings.


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