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The sad tale of a neck left in the sun http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10102&t=2516 |
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Author: | Josh H [ Tue Jul 19, 2005 7:02 am ] |
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Well some of you probably read the thread I started last week about speeding the drying time on KTM. Well that was really helpful, but I don’t have the space for a drying box of any kind right now. So I had to respray the face of a peghead a little while ago and thought I would try another sugestion that I have had from a few people (on and off this forum). That was to let the neck dry in the sun for a few hours. I figured that I would give it a try. It couldn’t hurt right (wrong! ![]() Well I brought it back into the shop this afternoon and was going to test fit it to the body. I began to work with it and noticed something strange. I had a gap between the body and the tongue of the fretboard on either side. This was weird because I have never had this problem before. Well it turns out that my tongue of my fretboard has gone slightly concave. ![]() So now that I have made this stupid mistake does anyone have any suggestions on how to fix it??? I was hoping to have this guitar done in the next few day but that will depend on if this problem can be solved. Any help would be appreciated. And I guess the moral of this sad tale is, Don’t leave your neck in the sun. Your fretboard could go concave. Or you may get a sunburn. ![]() Josh |
Author: | RussellR [ Tue Jul 19, 2005 7:12 am ] |
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Maybe some of the very experienced guys have a better solution, but you could try clamping the extension between two flat blocks, for a day or so and see if it can be pursueded to come back into shape. It won't clamp out when you glue the extension ? |
Author: | crazymanmichael [ Tue Jul 19, 2005 7:15 am ] |
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moisten and heat the cupped surface and clamp flat to a flat rigid plate such as aluminium or steel in place of the top. may take a couple of goes to get it flat again. you may also need to place a strip or two of masking tape on the plate centered on the cl of the fb extension to very slighten over bend to allow for spring back upon cooling. |
Author: | RussellR [ Tue Jul 19, 2005 7:22 am ] |
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Just the man I was thinking of ![]() |
Author: | Josh H [ Tue Jul 19, 2005 7:34 am ] |
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I have the extension moistened and clamped and it seems to be helping. I will try some heat in the mix and see if that helps even more. Keep the suggestions coming. Josh |
Author: | Jim Watts [ Tue Jul 19, 2005 8:27 am ] |
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It may also come back on its own if you give it a little time. It probably moved due to the humidity differences between your shop and the outdoors. This probably isn't what you want to hear though. |
Author: | PaulB [ Tue Jul 19, 2005 9:55 am ] |
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So the side that meets the body is convex right? This happened to me on my first (bought some ebony that must have still been a bit green), I tried clamping and heating, and ended up with a small crack. As a last resort, I put some CA on the crack, made up a sanding block out of mdf that allowed for the truss rod, and then very carefully sanded the hump out of the under side - being very careful not to remove any material from the fretboard edges. Probably not ideal, and probably means that the fretboard radius is a little flatter over the body, but you can't tell by looking at it or playing it (I know it's there tho ![]() I should add, that the hump was only about 1/32" high or maybe a bit less. |
Author: | crazymanmichael [ Tue Jul 19, 2005 11:34 am ] |
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when you want to bend wood you need heat, and straightening cups is bending; don't hesitate to apply heat to the extension. it will make the wood more plastic. the cupping was probably the result of differential drying in the sun; the top side getting more exposure dried out more and contracted, therefore cupped. |
Author: | John Mayes [ Tue Jul 19, 2005 11:37 am ] |
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I've had this happen before due to some blacklights in an enclosed box. The fingerboard cupped bad. I re-humidified it and let it sit for a couple weeks. It flattened back out. |
Author: | Josh H [ Tue Jul 19, 2005 1:21 pm ] |
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Well I have good news to report. After letting it sit clamped in the shop for a good 6-8 hours it is almost back to normal. Looks like with a bit more time it may correct itself. Thanks for all the tips they were useful and may come in hand should this ever happen again. Josh |
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