Darryl Keil Last Activity 2025-09-09 11:09 AM
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Max

Posts: 2

Joined: 2008-10-06
Location: Bethel Park, PA

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Subject : Press Lay Up & Sequence
Posted : 2008-10-06 12:06 PM
Post #34978
I usually place my face veneer down in the bag with glued substrait on top followed by backer and top caul. I am planning to press a large (7.5' d.) round table top with fairly unique pattern. Because of size, I would like to place the substrait down, spread glue, place face veneer on followed by a top caul, and slide it into the bag. Will this work OK? If I do this, I will need to apply the backer in a second pressing after the above is out of the bag. Is this OK or should I apply the backer first? Any helpful thoughts will be appreciated.


 
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Jeff Patrick


Joined: 2004-04-15
Location: Bainbridge Island, WA

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Subject : RE: Press Lay Up & Sequence
Posted : 2008-10-06 4:41 PM
Post #34979 - In reply to #34978
I often do the top and backers in separate sessions. But you want to do them back to back. Don't let the first sit around for awhile or some undesired warping could occur. I usually press the backer first because I'd rather slide the panel in on its backside rather than its face during the second pressing. If any damage is going to happen, I'd rather it be on the not-so-critical side.


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: Press Lay Up & Sequence
Posted : 2008-10-06 7:47 PM
Post #34980 - In reply to #34979
Great point Jeff! Never thought about casual damage sliding back into bag for 2nd pressing.
Max, you can probably omit the top caul when your substrate is on top of the glue layer and veneer, although it really doesn't matter. Pressing in two stages avoids the need for a top caul which in this case would be a custom size AND shape. You can use an oversize bottom caul and not cut a use-once round top caul. The one thing to consider is that when making the 2nd pressing if your first veneer is even slightly oversize the vacuum bag will want to fold it down along the side of your substrate. You might want to trim it very close to the substrate if oversize before beginning the 2nd pressing.


 
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Max

Posts: 2

Joined: 2008-10-06
Location: Bethel Park, PA

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Subject : RE: Press Lay Up & Sequence
Posted : 2008-10-07 7:56 AM
Post #34981 - In reply to #34980
Pressing the backer first is a good idea. I just hadn't thought through it. The top caul will be used when pressing the face veneer face up. This will make it much easier to handle this large piece. My main concern was in doing just one side at a time. There is no reason not to pull the first pressing out, flip it, and do the second side right away. I was only concerned about stability and balance. I didn't think it would be a problem, but it's good to hear of other's experience.

Thanks for your responses. It is always great to get some opinions when questions arise as I work alone these days.
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