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| Top inverted https://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=43067 |
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| Author: | Peebs [ Thu Mar 27, 2014 10:40 am ] |
| Post subject: | Top inverted |
My shop is not humidity controlled, so I have to wait for the weather to allow me to brace a top. When I braced the top, RH was 47%, then the weather changed before it was glued to the sides. RH dropped to 35% and the top inverted, it is now concave. Do I shave off the braces and start over, or will rehumidifying help ? Thanks Al |
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| Author: | John Arnold [ Thu Mar 27, 2014 11:54 am ] |
| Post subject: | Re: Top inverted |
You can rehumidify, but I would just change the braces. Usually, this means change the X-braces and the UTB. IMHO, there is nothing wrong with some inversion on the tone bars, since the string tension will tend to pull the top up below the bridge. Next time, use a hair dryer on the top for several minutes before gluing the braces. It is cheap insurance. |
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| Author: | Tom West [ Thu Mar 27, 2014 3:26 pm ] |
| Post subject: | Re: Top inverted |
Al: RH between 35% and 40% are what I look for before gluing cross grain. Also the wood should be in this range for a day or so before starting the process. Be sure your gauges are accurate. Tom |
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| Author: | Peebs [ Thu Mar 27, 2014 4:11 pm ] |
| Post subject: | Re: Top inverted |
Thanks for the info. I had quit building for a few years due to working too many hours. Now I'm retired and back to building. Thanks again. Al |
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| Author: | DennisK [ Thu Mar 27, 2014 5:45 pm ] |
| Post subject: | Re: Top inverted |
I agree with John... rebrace, because your current 35% humidity is just about ideal. |
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