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Help with veneer going funky

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Forum topic by Peter Knight posted 11-05-2009 09:45 PM 1060 views 0 times favorited 3 replies Add to Favorites Watch
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Peter Knight

53 posts in 2622 days


11-05-2009 09:45 PM

Ok ya’ll, I need a little bit of a bail out here.

I’ve got some beech veneer going all squirly on me (apparently I didn’t soften it enough.) I’m using Titebond’s Cold Press and the veneer is trying to bubble and buckle. Currently have rolled down the entire surface, starting in the middle and paying attention to the joints to keep them as close as possible. The entire carcass assembly is currently under a MDF Platen and weighted with appx 250 lbs of sand (all the clean sand I had in the shop)

my concern is that the weight I have applied will not be sufficent to flatten out the waves and bubbles that were developing (redeveloping!) as I put the platten on. Does anyone know if the cold press can be softened with a little heat and then repress just the loose sections? I know that a vacuum table would have been prefferable but that’s not budgeted until Jan!


3 replies so far

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Julian

880 posts in 2991 days


#1 posted 11-06-2009 12:56 AM

Well I don’t have any help for you, I’ll suggest when the budget allows it, check out joewoodworker and build your own vacuum setup. I built the venturi setup for a few hundred dollars, and that includes making the vacuum bag.

-- Julian, Park Forest, IL

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Peter Knight

53 posts in 2622 days


#2 posted 11-06-2009 03:58 AM

okay, for the record, you cannot use heat to seat blister and bubbles on cold set glue.

joewoodworker does state in one of his FAQ’s that it is possible to use heat, however he also says you must do it QUICKLY…. apparently I wasn’t quick enough.

However, you can you heat to help release the glue while peeling off the bad veneer job!

Drop back and punt, have the first try stripped off, and I’m currently going waiting for the filler to dry, then reprep the top, and then go again w/ paperbacked veener.

Julian: Thanks for the tip. I was aware of the EVS plans that joe sells, and infact that is what I was going to get in January (actually I was going to build a vacuum table!)

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Ger21

1047 posts in 2597 days


#3 posted 11-07-2009 01:50 AM

250lbs of sand isn’t nearly enough pressure. Vacuum will give you 1000-1500lbs/sq ft. And even with vacuum, you need to be quick with Titebond Cold Press glue. The moisture will quickly swell the veneer, and it’ll bubble if you don’t get it in the press fast enough.

As for the bubbles, I’ve had a few bubbled panels come out of the press (due to user error), and have never had any luck getting rid if them.

I also built a Joe Woodworker press, and spent less than $150 several years ago.

-- Gerry, http://www.thecncwoodworker.com/index.html http://www.jointcam.com

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