Glue up

[Indiana]

What’s going on here I’ve never had this happen before glue up with cascamite and a few days later the panels have started to open up

 

[TheUnicorn]

were your pressure / time / temperature the same as you had done in the past?

 

[Indiana]

were your pressure / time / temperature the same as you had done in the past?

Been using cascamite 20 years. Done nothing different. Never experienced this before

 

[profchris]

One possibility is you glued up in high humidity, and humidity has since dropped. The panels would shrink widthwise, starting at the ends, so you'd get differential shrinkage along the glue line with gaps starting at each end.

I'm assuming the gap wasn't there during a dry fit - if not, the wood has moved and humidity change is the obvious culprit.

 

[Indiana]

One possibility is you glued up in high humidity, and humidity has since dropped. The panels would shrink widthwise, starting at the ends, so you'd get differential shrinkage along the glue line with gaps starting at each end.

I'm assuming the gap wasn't there during a dry fit - if not, the wood has moved and humidity change is the obvious culprit.

Hi all glued up last Monday. Took them out of clamps Thursday. Machined them Friday. Today gaps.
All done in the worshop they haven’t left

 

[HOJ]

Another suggestion, new or old Cascamite? If it's got a Polyvine label on its old, they changed the formula, it failed, I stopped using it, now marketed by Ureka and back to its expected performance.

 

[Indiana]

Another suggestion, new or old Cascamite? If it's got a Polyvine label on its old, they changed the formula, it failed, I stopped using it, now marketed by Ureka and back to its expected performance.

It’s the same batch I’ve been using have a number of doors, cabinets and other furniture made with using the same glue. I’m at a loss as to why it’s happened

 

[meccarroll]

It is most likly the wood drying out on the ends faster than the rest. I had it happen once and it was simply shrinkage happening too fast. Now when I cut timber I usually leave it a couple of days before machining to size and gluing. Released tensions after sawing can cause twisting and unexpected shrinkage.

 

[Indiana]

It is most likly the wood drying out on the ends faster than the rest. I had it happen once and it was simply shrinkage happening too fast. Now when I cut timber I usually leave it a couple of days before machining to size and gluing. Released tensions after sawing can cause twisting and unexpected shrinkage.

Timber was purchased last month been sat in the shop

2 weeks ago I cut them
Machined them 10 days ago
Glue up 5” either end over length.

3 days in sash clamps

I then cut them down after all this they opened up in the ends