How long to clamp for?

[Fitzroy]

About to glue the windows, appreciate it's not normal or really required, but this is as much about joint practice and a learning opportunity as anything. Anyhow I've made a long clamp using bits of 4x2 and wedges, but only one, so the question is. How long do I need to leave the clamps on until I can take them off and glue the next frame?

Due to inclement weather I've moved the glue up into an unheated indoor room, but it's still about 15 celcuis.

Cheers F.

 

[Wildman]

depends on the setting time of the glue used I guess

 

[RobinBHM]

Generally you wont to keep clamps on for the full cure time, just enough time to be sure the glue has grabbed and there is no risk of the frame being knocked out of square by handling.

We generally use PU rapid for gluing up most simple joinery and can have clamps off and be machining the next operation after an hour or so.

 

[Ttrees]

What about using rope and wedges to tighten it
Might get you out of a pickle if you're not allready doing so
Looking good

 

[ColeyS1]

Can't you just screw them and leave the screws in ?

Coley

 

[marcros]

check the glue temp requirements- i am not sure that 15 is enough for PVA.

 

[ED65]

Yes 15° is a bit low for most PVAs.

 

[ColeyS1]

Check with the manufacturer. I'm fairly sure toolstation sell one that's good to 10 degrees. Tell tale signs it's too cold, are the pva glue dries to an almost white primer look on the surface of the timber.

Coley

 

[custard]

Minimum temp for Cascamite and most UF glues is 15 degrees. The problem with UF is that you have to maintain that temperature for several hours, where with PVA you just give the components a shot with a hot air gun before assembly and you're sorted, even outside in a frost.

 

[ColeyS1]

Minimum temp for Cascamite and most UF glues is 15 degrees. The problem with UF is that you have to maintain that temperature for several hours, where with PVA you just give the components a shot with a hot air gun before assembly and you're sorted, even outside in a frost.

I've always thought 10 degrees is the minimum for cascamite ?

Coley
Edit just looked at 25kg bag in workshop

Tack time 18hrs at 10 degrees 7hrs at 15 degrees. I always leave clamps on overnight minimum, so that's atleast 14hrs

 

[ColeyS1]

Toolstation glue

Coley

 

[owsnap]

I'm using the toolstation glue, and have used it in probably 10c and it has still set-off just fine, just has taken the whole night to do.
in normal temperature 2-3hours just to make sure