Glue up time - Router Forums
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post #1 of 21 (permalink) Old 01-02-2019, 05:40 PM Thread Starter
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Default Glue up time

On progressive builds I typically keep glued (Titebond III) joints clamped overnight before adding pieces in a stepwise process to complete the project. I appreciate that might be a bit of overkill time wise but then I’m not typically in the shop at night so no loss. More current projects however require that multiple pieces be glued in jigs before coming together into the final project. My question then is “How long should pieces be left clamped in a jig before they can be removed and set aside so the jig can be used multiple times per day.” These parts would not be under any stress other than being removed from the jig and set aside.

Thanks in advance.

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post #2 of 21 (permalink) Old 01-02-2019, 06:02 PM
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on the back of the bottle the directions state you can remove clamps after 30 mins crowd...
that must be under ideal conditions...

Me!!!
I'm in the clamping an unstressed joint for thirty minutes to an hour....
Stressed joints, 24 hours...
no stressing the new joint for at least 24 hours....

the tech data on TB III....

Application Temperature:
Above 47°F.

Open Assembly Time:
8-10 minutes (70°F./50%RH)

Total Assembly Time:
20-25 minutes (70°F./50%RH)

Minimum Required Spread :
Approximately 6 mils or 250 square feet per gallon

Required Clamping Pressure:
Enough to bring joints tightly together (generally, 100-150 psi for softwoods, 125-175 psi for medium woods and 175-250 psi for hardwoods)

Method of Application:
Plastic bottles for fine applications; glue may also be spread with a roller spreader or brush.

Cleanup:
Damp cloth while glue is wet. Scrape off and sand dried excess.

Limitations:
Not for continuous submersion or for use below the waterline. Not for structural or load bearing applications. Use when temperature, glue and materials are above 45°F. Store product below 75°F. Storage above this temperature may cause product to thicken and reduce the usable shelf life. If thickened, shake vigorously by firmly tapping bottle on a hard surface until product is restored to original form. Because of variances in the surfaces of treated lumber, it is a good idea to test for adhesion.
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post #3 of 21 (permalink) Old 01-02-2019, 06:38 PM Thread Starter
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@Stick486

Thanks Stick. I was aware of the “theory” as in the instructions and was looking for best practice, I.e.,your 1 hour suggestion.

Jon

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post #4 of 21 (permalink) Old 01-02-2019, 07:55 PM
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In response to the glue time question I would like to submit that if the joint is long grain to long grain you really do not need clamps at all. You create a "rubbed joint." This can be done with any of Titebond PVA's or its liquid hide glue. After spreading the glue on both surfaces just rub them back and forth until it gets difficult to move them. Then shift the pieces to their final position and put it aside.
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post #5 of 21 (permalink) Old 01-02-2019, 10:22 PM
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Often I don't use clamps, just weights. Usually just leave the weights on, because I don't do anything with glue ups until the next day anyway. And, depending on what the project is, may not use weights or clamps at all, just set it somewhere that it won't get disturbed.
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post #6 of 21 (permalink) Old 01-03-2019, 06:12 AM
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I'm with Stick on this one. I generally wait about an hour on non-stressed joints and 24 hours on stressed joints. I also have use the rub method on long grain jobs with success. On end grain I have found that if I put a light film of glue on and let it sit for several minutes and then apply a normal amount to the pieces, rub them together, clamp tightly, I have better results than if I just apply glue and clamp.
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post #7 of 21 (permalink) Old 01-03-2019, 08:46 AM
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alot has to do with the temp and humidity you're in. My basement shop is pretty consistant at around 63 degrees and 45-50%. With small and/or narrow pieces usually a hour/45 minutes is plenty of time to leave clamped up, then leave unstressed overnight. Bigger thicker pieces I just leave overnight. With the smaller pieces I keep an eye on the squeeze out and use that as a barometer for when to remove the clamps.
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post #8 of 21 (permalink) Old 01-03-2019, 09:01 AM
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Quote:
Originally Posted by TwoSkies57 View Post
alot has to do with the temp and humidity you're in. My basement shop is pretty consistant at around 63 degrees and 45-50%. With small and/or narrow pieces usually a hour/45 minutes is plenty of time to leave clamped up, then leave unstressed overnight. Bigger thicker pieces I just leave overnight. With the smaller pieces I keep an eye on the squeeze out and use that as a barometer for when to remove the clamps.
I do as Stick and Bill w/1 hour minimum at low humidity and I clamp everything. At that point I do let stand overnight regardless unless I have pinned/stapled the joint as in maybe shop drawers.
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post #9 of 21 (permalink) Old 01-03-2019, 09:32 AM
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When teaching a class I can run out of clamps depending on the projects and how many students. I agree that a non stressed joint can be 45 min. to an hour in clamps. Others would be overnight to 24 hrs. It's amazing how creative woodworkers can be when it comes to clamps. I have used bench vises, clamps of all kinds, vice grips and welders vice grips, ratchet straps, bungy cords and on small parts even elastics or packing tape. Luckily I just acquired 8 new Bessy clamps with my gift card for Christmas.
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post #10 of 21 (permalink) Old 01-03-2019, 09:53 AM
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add shrink wrap to the list and sliced inner tubes...
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