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

Posts: 5

Joined: 2009-03-23
Location: Bend, Oregon

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Subject : curved lamination
Posted : 2009-03-24 12:37 AM
Post #35325
I am making several curved frame and panel drawer fronts out of walnut. The frames parts will be 3" wide and 1 1/8" thk and the joinery will be cope and stick (hence the lamination). The radius is approximately 6'. Is it sensible to make these parts in a vacuum press? I was unable to find any posts covering curved laminations. If there are any, can someone direct me to them?

Thanks, David


 
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Don Stephan

Posts: 825

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

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Subject : RE: curved lamination
Posted : 2009-03-24 2:11 PM
Post #35326 - In reply to #35325
Your post didn't mention how long the rail sections will be, but in general bent laminations can be done very effectively in a vacuum press either of two ways. You can either clamp the laminations against an internal pattern with a solid platen in the bag, or clamp the laminations to each other and then while the glue is uncured clamp the bag and all to an external pattern. Both of these techniques are well documented and explained in Darryl's second video, which I highly recommend.

Just out of curiosity, how will you form the sticking and joints on bent members?


 
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Danek

Posts: 5

Joined: 2009-03-23
Location: Bend, Oregon

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Subject : RE: curved lamination
Posted : 2009-03-24 7:28 PM
Post #35327 - In reply to #35326
Thanks for the reply Don. I didn't think there would be an issue with doing it but thought I'd check here for available info. The video you refer to is the one titled "Working in a Vacuum"? Looks there could be alot of useful info there.
The rails on my project will be approx. 24" long. For the sticking, my thought was to use a straight bit for the slot and a round over bit for the profile, running the pieces vertically against a curved fence. The cope done horizontally on a shaper with curved support.
The project is building a library/office around 300 degrees or so of a 14'DIA rotunda. Lots of vacuum bag work!

David


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: curved lamination
Posted : 2009-03-25 4:31 PM
Post #35330 - In reply to #35327
David,

A question for you. How many laminations total on this lay up and how thick are each lamination?

Darryl Keil


 
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Danek

Posts: 5

Joined: 2009-03-23
Location: Bend, Oregon

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Subject : RE: curved lamination
Posted : 2009-03-25 8:43 PM
Post #35332 - In reply to #35330
Darryl,
I need approx. 30 pcs. of varied radii. I have built 3 forms to start with and will add to them for the various radii. The thicknesses of parts are 1-1/8, 5/8, 1/2, and 3/4. Lengths are between 20 and 35 inches. Widths vary from 1-1/2 to 9". I did some testing today on the laminations and it seemed that 1/8" to 3/16" thk pcs were pretty flexible for the radius I'm making.

David



 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: curved lamination
Posted : 2009-03-27 12:37 PM
Post #35333 - In reply to #35332
David,

Assuming you are using a vacuum press to do this, I would like to recommend that you use a piece of 3/8" bending ply on top of your laminations. This will help to keep the glued up stack from crowning slightly across the middle.

Darryl Keil


 
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Danek

Posts: 5

Joined: 2009-03-23
Location: Bend, Oregon

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Subject : RE: curved lamination
Posted : 2009-03-27 8:08 PM
Post #35334 - In reply to #35333
Thanks for the tip. I have glued up a few of the 1-1/8"thk pcs with no problems. I'll add the bending ply on top of the rest.

David
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