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Side flex on mahogany dreadnought
https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=18535
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Author:  Jeremy Douglas [ Mon Aug 25, 2008 7:29 pm ]
Post subject:  Side flex on mahogany dreadnought

While squaring up my sides the other day I noticed I could easily make the sides (below the waist on the flat part) flex by pushing on them in the middle... is this normal? It's a LMI kit with pre-bent sides, I think they were about .095" thick. I also put bias tape strips in there with fish glue. Will they stiffen up once the porefiller,shellac, and tru-oil go on?

And no, it's not because I sanded the sides too thin.

Author:  Hesh [ Mon Aug 25, 2008 7:46 pm ]
Post subject:  Re: Side flex on mahogany dreadnought

No problem Jeremy my friend if your sides are around .095 some softness when one tries to press a thumb into a side with moderate or more pressure is not a problem. Mahogany can do this as can other woods too.

The real purpose of the side tapes is to arrest a side crack from traveling not to stiffen the sides.

Your cool. [:Y:]

Author:  Jeremy Douglas [ Mon Aug 25, 2008 8:40 pm ]
Post subject:  Re: Side flex on mahogany dreadnought

Thanks. Having seen this I couldn't imagine not using any kind of side reinforcement. Spruce braces don't seem like a bad idea.

Author:  Jeremy Douglas [ Mon Aug 25, 2008 9:21 pm ]
Post subject:  Re: Side flex on mahogany dreadnought

ToddStock wrote:
Lots of guitars without. My D-15 has .075 sides which will flex at least 1/8" in the flats...it's fine, and will probably outlast me.


My all mahogany Larrivee OM has no side supports but there's no flex that I can see. I wouldn't be surprised if the Larrivee had really thick sides though.

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