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| moisture content & gluing bridge http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=51864 |
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| Author: | mikemcnerney [ Sun Apr 28, 2019 7:43 am ] |
| Post subject: | moisture content & gluing bridge |
I didn't get as far along with my build this winter as I had hoped. I got the box built and the neck fairly close to final fitting. As spring slowly approaches here in eastern Canada though I am wondering if it is too late to glue my bridge on. My honeywell30 buck gauge says 41% but I don't have complete confidence in it. It's jus rainy a lot now & it feels damper. At what humidity do you think it's too high to glue a bridge on. |
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| Author: | Terence Kennedy [ Sun Apr 28, 2019 9:31 am ] |
| Post subject: | Re: moisture content & gluing bridge |
Theoretically I would think that the closer you are to what the relative humidity was when you closed the box the better. That’s where the top should be happiest and move the least. |
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| Author: | Barry Daniels [ Sun Apr 28, 2019 10:42 am ] |
| Post subject: | Re: moisture content & gluing bridge |
Sounds like you need to calibrate your gauge. |
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| Author: | Joe Beaver [ Sun Apr 28, 2019 11:19 am ] |
| Post subject: | Re: moisture content & gluing bridge |
I don't have a climate controlled shop so I do pay attention to humidity, for things like shaping and gluing braces, closing the box, attaching the fingerboard and applying finish, but.. I have never worried about RF when gluing a bridge. The only thing I do is dry fit it. As long as it still fits nicely, and hasn't curled up on me, I glue it. I have never noticed a problem. |
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| Author: | johnparchem [ Sun Apr 28, 2019 11:40 am ] |
| Post subject: | Re: moisture content & gluing bridge |
I agree with Joe, I have never overly concerned myself about when I glue it on. Living in the pacific northwest where rain is a way of life,we often have months where it rains everyday, there is not a great relationship between rain and relative humidity. Sure evaporation of the rain might raise it a bit. We rarely go over 50% RH. In a cup put a half a cup of salt in a 1/4 cup of water. The salt will not totally dissolve. Seal that and your gauge in a seal-able plastic bag. Wait eight hours and see how close your gauge is to 75%. I suspect that you are well in the range to glue on a bridge. Spring is probably the best time of year out east. It is not so cold that heated air is super dry also the summer humidity has not started. |
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| Author: | doncaparker [ Sun Apr 28, 2019 11:52 am ] |
| Post subject: | Re: moisture content & gluing bridge |
Potassium carbonate is a better salt to use to calibrate a hygrometer for our purposes, because it creates a relative humidity in the range we want (around 43%). |
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| Author: | Colin North [ Sun Apr 28, 2019 12:10 pm ] |
| Post subject: | Re: moisture content & gluing bridge |
What Don said. ^^^ |
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| Author: | mikemcnerney [ Sun Apr 28, 2019 12:44 pm ] |
| Post subject: | Re: moisture content & gluing bridge |
thanks all |
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| Author: | meddlingfool [ Sun Apr 28, 2019 9:47 pm ] |
| Post subject: | Re: moisture content & gluing bridge |
Fwiw, at the largish factory that was my last job, all guitars were put in the climate room before bridge fit... |
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| Author: | mikemcnerney [ Mon Apr 29, 2019 4:40 am ] |
| Post subject: | Re: moisture content & gluing bridge |
Do you remember what the RH was kept at in that room & for how long. My guess is that thin soft wood (spruce) would stabilize in a few days?? |
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| Author: | meddlingfool [ Mon Apr 29, 2019 10:46 am ] |
| Post subject: | Re: moisture content & gluing bridge |
42%, from an environment that was not too far off from that most of the time. At least 24hrs, often longer... |
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