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| Joined top has warped - please help http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=11054 |
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| Author: | John Lewis [ Thu Feb 22, 2007 9:27 am ] |
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Howdy gang- I have this joined spruce top that has warped on each side across the grain (top is straight along the grain) and is in an "S" shape. It has a rosewood rosette, if that makes a difference. How can this be fixed so it's flat? Gentle heating, wetting or weight and stickering? All of the above? Something else? Thanks and please help- 
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| Author: | peterm [ Thu Feb 22, 2007 9:49 am ] |
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John, I've seen tops warping like this before due to low humidity... I had one warp some and I placed it under a flat board for a couple of days, it still wasn't perfect but the bracing brought it back to shape. |
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| Author: | Pwoolson [ Thu Feb 22, 2007 9:51 am ] |
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Flip it over and my guess is that it will be flat by morning. Don't worry about it much. Just brace it up and it will be fine. Though, you might want to keep an eye on your humidity. |
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| Author: | Steve Saville [ Thu Feb 22, 2007 9:51 am ] |
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Are you controling humidity? If so, how long have these parts been controlld? |
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| Author: | Dave Rector [ Thu Feb 22, 2007 10:11 am ] |
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What Paul said. |
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| Author: | John Mayes [ Thu Feb 22, 2007 10:15 am ] |
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yep this is purely a humidity issue. Sticker it, and control the humidity and within a few days it should be golden. |
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| Author: | gozierdt [ Thu Feb 22, 2007 10:17 am ] |
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If the simple fix of flipping it over doesn't work, it may have warped from uneven stresses in the piece set up when it was thinned down. I have had success in wetting the concave side and bending it back over a small batten using weights on each of the sides sticking up. Put the batten under the deepest part of the curve, and weights on each side to hold the sides down. It may take a day or two for a stubborn piece. |
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| Author: | SteveCourtright [ Thu Feb 22, 2007 10:33 am ] |
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Agree with the others, if it started out flat it can go back. Also: Never hold your top up in the window! 
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| Author: | tippie53 [ Thu Feb 22, 2007 10:39 am ] |
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Not a problem. Humidity issue. You want to maintain 45% to 55%. If that isn't possible place this between some weight for a few weeks and brace it up when your Relative Humidity is in the 40% range. You won't have much trouble once the braces are glued in. Humidity can cause alot of funny things to happen to wood john hall blues creek guitars |
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| Author: | John Lewis [ Thu Feb 22, 2007 2:49 pm ] |
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Thanks all for the advice. This is a really nice Italian Fiemme spruce top that is cut out to a Martin 0-12 fret shape. I got it from a pretty decent fellow we all know here on the forum. I want to build a 25.7" scale fingerstyle guitar with 13 frets to the body with this top. I've got a small Cuban mahogany back and side set this may go well with. Unfortunately, I have no way of controlling humidity and it is down to about 29% now. I guess everyone is right about humidity doing bad things. I'll have to weight and sticker it and wait for the humidity to go back to normal. Thanks again everybody- |
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