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| Hot Box for Soundboard Before Gluing Braces http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=54960 |
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| Author: | davidson [ Thu May 05, 2022 6:03 am ] |
| Post subject: | Hot Box for Soundboard Before Gluing Braces |
I see in piano and harp building it is common to dry the soundboard in a hot box before attaching the braces. You can also see Jonny Kinkead possibly doing something similar in the build series linked below: https://www.youtube.com/watch?v=aAV9U3WzzP8 Dan's Acoustic Guitar Build Part 1/5 With Master Luthier Jonny Kinkead Does anyone building here have an intentional heated drying session before gluing the braces? Thanks, Chuck |
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| Author: | Colin North [ Thu May 05, 2022 6:22 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Hard to find with no reference in your post to specific time /part - ?/5 no. I bake my tops (and bracing) in a hot box (95-100 deg C 1.5 hrs) and leave them to re-acclimatize them before jointing the top and bracing it to pre-shrink and condition them (quite a common practice - taylor etc.), but would hesitate to heat the soundboard in a hot box before bracing because of the glue joint. I've heard Martin used to keep their tops in a warm area (attic?) before bracing if that helps. |
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| Author: | davidson [ Thu May 05, 2022 6:54 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Thanks. Kinkead video part 1 of 5 around 12:02. |
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| Author: | Colin North [ Thu May 05, 2022 8:09 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
In a drying cabinet he says, looks like he's using a domestic a domestic air conditioner, maybe to feed dry air (which will be warm) into the drying cabinet. |
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| Author: | jfmckenna [ Thu May 05, 2022 9:10 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
I have used an oven before but if you keep your wood in your controlled shop you should not have an issue with it imho. |
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| Author: | Pat Foster [ Thu May 05, 2022 9:37 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
I bake all my tops just to get put them through the first cycle of shrinkage and let them acclimate before gluing on the braces. A world-class classical builder I know dries his tops to 3% and glues his braces with the tops still at 3%. When they acclimate to his shop humidity, they expand, forcing a dome. |
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| Author: | Jim Watts [ Thu May 05, 2022 10:17 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Pat Foster wrote: I bake all my tops just to get put them through the first cycle of shrinkage and let them acclimate before gluing on the braces. A world-class classical builder I know dries his tops to 3% and glues his braces with the tops still at 3%. When they acclimate to his shop humidity, they expand, forcing a dome. Pat, does he brace the top in a flat condition? Interesting. |
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| Author: | Pat Foster [ Thu May 05, 2022 1:18 pm ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Jim Watts wrote: Pat Foster wrote: I bake all my tops just to get put them through the first cycle of shrinkage and let them acclimate before gluing on the braces. A world-class classical builder I know dries his tops to 3% and glues his braces with the tops still at 3%. When they acclimate to his shop humidity, they expand, forcing a dome. Pat, does he brace the top in a flat condition? Interesting. Jim, Couldn't tell you. If I get a chance, I'll ask him next time I see him. |
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| Author: | Jim Watts [ Thu May 05, 2022 2:13 pm ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Thanks! |
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| Author: | davidson [ Thu May 05, 2022 6:46 pm ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Thanks all. |
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| Author: | Hesh [ Fri May 06, 2022 5:24 am ] |
| Post subject: | Re: Hot Box for Soundboard Before Gluing Braces |
Bracing in extremely low RH has been done by piano manufacturers, violin makers, mando makers and guitar makers. It's another approach to producing instruments that can withstand RH swings to a greater degree, hopefully. We think it's helpful but it's not anything new it's been done for a very long time and likely was done before we had machines to manipulate our environments by batching work and jobs for seasonal opportunities when the RH is right. |
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