pkinneb Posted June 24, 2018 Report Share Posted June 24, 2018 Hey folks I am using a vacumm press to clamp 1/16" thick veneer on the door below. The door was pre-made with veneer glue using a form and clamps so this is just adding the outer skin. Because of that I used Titebond III rather than mix more veneer glue. My question is how long do I need to keep it under vacuum? Its a pretty tight radius and although I have had the system for years I have not used it much. Thanks Quote Link to comment Share on other sites More sharing options...
Mick S Posted June 24, 2018 Report Share Posted June 24, 2018 I use TB III for most of my veneer press jobs. I leave it a minimum of about 6 hours, but usually overnight if possible. Have you ever used bending ply for curves like that? Much easier and faster than building up the core. Quote Link to comment Share on other sites More sharing options...
wdwerker Posted June 24, 2018 Report Share Posted June 24, 2018 I usually leave it overnight. Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 24, 2018 Author Report Share Posted June 24, 2018 6 minutes ago, Mick S said: I use TB III for most of my veneer press jobs. I leave it a minimum of about 6 hours, but usually overnight if possible. Have you ever used bending ply for curves like that? Much easier and faster than building up the core. Thanks. Yes that is three layers of bending ply with 1/16" book matched curly maple veneers. Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 24, 2018 Author Report Share Posted June 24, 2018 3 minutes ago, wdwerker said: I usually leave it overnight. Perfect thanks that's what I needed to know! Like Mick I thought 6 hours but decided it would be a good thing to ask and will go with the overnight recommendation you both made. Quote Link to comment Share on other sites More sharing options...
wdwerker Posted June 24, 2018 Report Share Posted June 24, 2018 It's the slower set time & tight radius that would make me be overly cautious. 2 Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 24, 2018 Author Report Share Posted June 24, 2018 Yep makes total sense and the last thing I want to do is remake them now so leaving in over night is no problem. Thanks again guys!! Quote Link to comment Share on other sites More sharing options...
wdwerker Posted June 24, 2018 Report Share Posted June 24, 2018 Most vacuum press pumps cycle so the pump doesn't run all the time. Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 24, 2018 Author Report Share Posted June 24, 2018 Just now, wdwerker said: Most vacuum press pumps cycle so the pump doesn't run all the time. Yep that's how mine works. Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 25, 2018 Author Report Share Posted June 25, 2018 Thanks again for the advice guys!! Had a couple minor issues but over all very happy. As you can see in the first pic the over hang on the back of the door was a bit long and caused a small crack I had to deal with. In the second pic you can see the damage to the form which had more to do with the fact that it was made for clamps and not a vacuum system. That will have to be fixed before door two. Other than that the door cleaned up very nice. The book match joint on the side is good but not great. The joint at the front corner turned out great. Can't wait to see it with finish on it. I will modify/fix the form for the second door. Thanks again for the great advice!! 2 Quote Link to comment Share on other sites More sharing options...
wdwerker Posted June 25, 2018 Report Share Posted June 25, 2018 Glad it turned out well ! 1 Quote Link to comment Share on other sites More sharing options...
Ronn W Posted June 25, 2018 Report Share Posted June 25, 2018 Ok so I have a question. Since titebond PVA glues cure in the air and there is no air in the vaccum bag isn't it true that while the glue whill start to cure and gain some strength in the bag, it will not come up to final strength until sometime after it is removed from the bag???? Quote Link to comment Share on other sites More sharing options...
pkinneb Posted June 25, 2018 Author Report Share Posted June 25, 2018 36 minutes ago, Ronn W said: Ok so I have a question. Since titebond PVA glues cure in the air and there is no air in the vaccum bag isn't it true that while the glue whill start to cure and gain some strength in the bag, it will not come up to final strength until sometime after it is removed from the bag???? Not sure of the science my guess is its not really removing all the air but I can tell you after 18 hours it was definitely cured, the glue I planed off was hard as a rock. Quote Link to comment Share on other sites More sharing options...
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