Solid but squishy. Sort of like rubber. Jim's firm jello description is also good, since that's basically what it is
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| Author: | meddlingfool [ Fri May 04, 2018 4:11 pm ] |
| Post subject: | 'Resting' state of hide glue... |
Greetings... When your premixed hide glue is in the fridge waiting to be reheated, what is its form like? Is it dried like cured glue, glass like and crystalline, or a goopy gelatinous mess? |
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| Author: | Jim Watts [ Fri May 04, 2018 4:15 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Firm jello. |
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| Author: | DennisK [ Fri May 04, 2018 4:18 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Solid but squishy. Sort of like rubber. Jim's firm jello description is also good, since that's basically what it is
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| Author: | meddlingfool [ Fri May 04, 2018 5:10 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Ok thanks. Mine too. But then I wondered if it was supposed to be glass like. I've had a few bridges come up and wondered if I perhaps had bad glue. But no, I can once more rest assuered that it's something I've done:) |
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| Author: | Allen McFarlen [ Fri May 04, 2018 10:01 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Mine is 315gm strength glue and it's very firm gello like. If your bridges are lifting and you're certain your technique is good, perhaps you are making the glue up a bit too thin. |
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| Author: | meddlingfool [ Fri May 04, 2018 10:43 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
That's my best guess. |
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| Author: | Greg Maxwell [ Sat May 05, 2018 6:38 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
You can always test your theory by using Titebond to glue a couple bridges, using the same preparation techniques. If they stay down, the evidence is that the glue is to blame. |
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| Author: | meddlingfool [ Sat May 05, 2018 10:18 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Yeah, I switched back to TB. Thing is, they stayed down for nearly two years, then suddenly a rash of them in different circumstances all over the place. Go figure... |
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| Author: | doncaparker [ Sun May 06, 2018 8:33 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Pure speculation here: I wonder if the crystalline nature of dried hide glue, combined with a relatively stiff bridge, combined with a relatively flexible top and bridge plate, combined with a fair amount of relative humidity variation, and combined with something less than a perfect fit of the mating parts, could lead to this type of failure. If the top and bridge plate are swelling and shrinking, getting rounder and flatter as the RH fluctuates, but the bridge is pretty stiff, staying flat, I can see hide glue letting go if the joint is not spot on at all points that feel the stress. |
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| Author: | Clay S. [ Sun May 06, 2018 8:51 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
"If your bridges are lifting and you're certain your technique is good, perhaps you are making the glue up a bit too thin." For gluing bridges I like the glue to have the consistency of treacle. For gluing violin plates I like it to be thinner. Changing the viscosity of the glue and the ultimate strength to suit different uses is one of the great things about hide glue. |
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| Author: | ernie [ Sun May 06, 2018 11:47 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
You might one to test your batch of HHG, on scrap for 24hrs and then see how easily it will steam apart |
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| Author: | doncaparker [ Sun May 06, 2018 5:23 pm ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Clay S. wrote: "If your bridges are lifting and you're certain your technique is good, perhaps you are making the glue up a bit too thin." For gluing bridges I like the glue to have the consistency of treacle. For gluing violin plates I like it to be thinner. Changing the viscosity of the glue and the ultimate strength to suit different uses is one of the great things about hide glue. Ditto. |
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| Author: | meddlingfool [ Mon May 07, 2018 2:38 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
I don't actually know what treacle's consistency is. But I'm 90% sure I've been making my HHG too thin. |
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| Author: | Colin North [ Mon May 07, 2018 4:02 am ] |
| Post subject: | Re: 'Resting' state of hide glue... |
Treacle's consistency is similar to syrup if that helps. |
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