Darryl Keil Last Activity 2025-05-12 11:03 AM
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Camille

 
Subject : pressing 1/2 of long panel at a time
Posted : 2006-07-16 2:53 PM
Post #33190
Does anyone have any experience using a 4'x8' bag to press 1/2 of a 14' panel at a time? Are there any tricks that I might try to seal the bag at the half way point and still achieve enough pressure for a successful glue up without buying another bag for this one job?
Thank you.


 
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Darryl Keil

Posts: 1454

Joined: 2003-05-22
Location: Maine

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Subject : RE: pressing 1/2 of long panel at a time
Posted : 2006-07-16 9:21 PM
Post #33191 - In reply to #33190
Camille,

I have an idea for you but I need to know what you have for a vacuum pump first.

Sincerely
Darryl Keil


 
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Camille

 
Subject : RE: pressing 1/2 of long panel at a time
Posted : 2006-07-17 9:13 AM
Post #33192 - In reply to #33191
Thank you so much, Daryl, for responding so quickly to my question. I purchased your "standard" pump about a month ago.

A little more info on the project. I am building a credenza to house an electrically controlled projection screen. The door of the projection screen box is 158" long and I am told that it is some kind of hollow core construction. I will need to veneer it, hopefully without cutting it in two then glueing it back together.

The top to the credenza and the top of the screen box will be as close to flush as I can get it, but for transportation purposes I am willing to build the credenza top in two pieces, unless I can figure something else out. I was not able to purchase 14' long veneer so it will be necessary to butt splice to achieve length. I am working on some kind of detail to make the joint make sense. I was thinking of using 3/4" Baltic birch ply.

Any advice would be appreciated.

Sincerely, Camille





 
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Darryl Keil

Posts: 1454

Joined: 2003-05-22
Location: Maine

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Subject : RE: pressing 1/2 of long panel at a time
Posted : 2006-07-17 9:58 PM
Post #33193 - In reply to #33192
Camille,

Sounds like a interesting and challenging project. As far as pressing you're 14' panel in a 8' bag I would suggest an different route. I think you would find you're existing bag far too problematic for this.

Make a one shot bag from 6mil plastic and a nipple patch kit. Have this piece of plastic a little over twice as wide as your panel and about 15' long. Set you're platen on top of the plastic sheet then add the panel you are veneering. Fold the plastic over the panel and duct tape it on three sides. You will have already attached the nipple patch kit on the bottom of the plastic similar to your existing bag. Connect the hose up into the platen like you would normally do.

Now because this bag will not seal as well as a manufactured bag, trying to have the pump cycle on and off is probably not going to work. You would have the pump run continuously instead to stay ahead of the leaks. Because your pump is inside a closed box and is designed to cycle on and off it will overheat if run non-stop. The solution to this problem is to take off the cover and put a fan on the motor during pressing. You will run the pump in the continuous run mode.

I hope this explanation makes sense. If not feel free to give me a call.

Sincerely
Darryl Keil


 
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Camille

 
Subject : RE: pressing 1/2 of long panel at a time
Posted : 2006-07-19 11:09 AM
Post #33195 - In reply to #33193
Thank you for your suggestions. A friend of mine here in Austin was following this thread and gave me a call about a website that sells vacuum pressing supplies among other things.

www.acp-composites.com/

Check it out......

I was able to order a 2 mil. nylon, 18" wide tube bag 5 yards long with two closer strips for $21 (that's including shipping!).
Now, granted it being thin material may mean that it will only last for one pressing, but if it works on this simple panel it may be worth it.
I will let you know.

Camille




 
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Jeff Patrick


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

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Subject : RE: pressing 1/2 of long panel at a time
Posted : 2006-07-18 7:52 PM
Post #33194 - In reply to #33192
Rather than butt the short veneer you might consider sawing your own. 14' lumber is fairly easy to obtain. A well tuned bandsaw will easily cut 1/16" veneer.
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