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| Minimum glue time for... http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=31346 |
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| Author: | meddlingfool [ Thu Mar 03, 2011 1:33 am ] |
| Post subject: | Minimum glue time for... |
What is the minimum amount of time you would leave a back joint glue up in clamps before thickness sanding it? Thanks |
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| Author: | runamuck [ Thu Mar 03, 2011 1:37 am ] |
| Post subject: | Re: Minimum glue time for... |
A couple hours unless it's humid or cold. Then I would double it. |
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| Author: | Colin North [ Thu Mar 03, 2011 4:12 am ] |
| Post subject: | Re: Minimum glue time for... |
I class thickness sanding as subjecting the joint to stress, and normally clamp for a couple of hours, then let it sit for 24 hours total drying time before "final" thicknessing. |
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| Author: | Tom West [ Thu Mar 03, 2011 4:33 am ] |
| Post subject: | Re: Minimum glue time for... |
Concur with Colin on this one. If the joint is to be worked or stressed 24 hrs after gluing.No scientific reason,just insurance. Tom |
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| Author: | Colin North [ Thu Mar 03, 2011 4:51 am ] |
| Post subject: | Re: Minimum glue time for... |
Colin North wrote: I class thickness sanding as subjecting the joint to stress, and normally clamp for a couple of hours, then let it sit for 24 hours total drying time before "final" thicknessing. Also I would not glue up in cold or damp conditions, just asking for trouble. |
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| Author: | bluescreek [ Thu Mar 03, 2011 7:01 am ] |
| Post subject: | Re: Minimum glue time for... |
it depends on glue used. Tite bond you can work on after an hour. I have used fish glue ( 2 hrs and hot hide glue ) CA in about 10 minutes. |
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| Author: | Colin North [ Thu Mar 03, 2011 7:12 am ] |
| Post subject: | Re: Minimum glue time for... |
Sorry, I should have been clear - I was talking titebond original, and I am just following manufacturer's recommendations. There's usually plenty other things I can be doing while plates are being glued together- cutting braces, initial sizing of them, thicknessing sides, bending them, making end blocks, bindings, rosettes etc. so I don't see any point in pushing one particular process. |
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| Author: | Alain Desforges [ Thu Mar 03, 2011 9:23 am ] |
| Post subject: | Re: Minimum glue time for... |
John, I think you mean 12 hours for the fish glue? IIRC, they recommend a 12 hour clamp time on it. I would just double the manufacturer's recommendations. They say about 1/2 hour clamp time for Titebond, so I'd wait maybe an hour. You don't stress the plate all that much thickness sanding it, not unless you're trying to take off a lot at once. Just take light passes and you won't be heating up your fresh glue joint too much. |
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| Author: | bluescreek [ Thu Mar 03, 2011 9:36 am ] |
| Post subject: | Re: Minimum glue time for... |
I have thicknessed fish glue after 2 hours without any problem . I do reclamp after thicknessing. |
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| Author: | Mark Groza [ Thu Mar 03, 2011 10:39 am ] |
| Post subject: | Re: Minimum glue time for... |
Titebond and 24 hrs. for me. |
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| Author: | peterm [ Thu Mar 03, 2011 10:46 am ] |
| Post subject: | Re: Minimum glue time for... |
I set the timer for 45 minutes and start working in after that...with Titebond. |
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| Author: | meddlingfool [ Thu Mar 03, 2011 10:48 am ] |
| Post subject: | Re: Minimum glue time for... |
Thanks all... |
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| Author: | Laurent Brondel [ Thu Mar 03, 2011 12:44 pm ] |
| Post subject: | Re: Minimum glue time for... |
It is less dramatic for hardwoods, but for soft woods I like to wait overnight before thicknessing. Otherwise, when the moisture from the glue completely evaporates, the centre seam can become slightly thinner than the surrounding area. This is valid for PVA or HHG, or any water based adhesive. No such issue with CA, epoxy or polyurethane. |
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| Author: | meddlingfool [ Thu Mar 03, 2011 3:09 pm ] |
| Post subject: | Re: Minimum glue time for... |
I've noticed that with rosettes for sure. |
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| Author: | Mark Groza [ Thu Mar 03, 2011 4:05 pm ] |
| Post subject: | Re: Minimum glue time for... |
I give rosettes 3 days. |
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| Author: | Brian Forbes [ Fri Mar 04, 2011 1:30 am ] |
| Post subject: | Re: Minimum glue time for... |
I give it an hour or two and then start carving. The bottle says 24 hours before stressing, but again, living in AZ the glue dries up so fast that the bond sets much faster. On a neck/fretboard glue up, I give it overnight because it's alot of glue in a confined space, but everything else comes out as soon as the glue run off has hardened and turned yellow. I have never had a seam break on me either using the impatient method I am describing. |
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| Author: | fric [ Fri Mar 04, 2011 5:10 am ] |
| Post subject: | Re: Minimum glue time for... |
1 hour , 45min, ..... there are brave men here! |
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| Author: | Mark Groza [ Fri Mar 04, 2011 11:02 am ] |
| Post subject: | Re: Minimum glue time for... |
I would think with some glues the wood would pick up moisture and need some time to dry. The glue might look dry on the outside, but not so inside the joint. So that's why i give it the extra time.  Better to be safe than sorry when it comes to joint failure.
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| Author: | Chris Pile [ Sun Mar 06, 2011 4:45 pm ] |
| Post subject: | Re: Minimum glue time for... |
I've always been a 24 hour guy myself. I'd rather not get in a hurry to ruin something or waste my time. |
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