Darryl Keil Last Activity 2025-02-12 2:48 PM
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Tim

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Joined: 2007-06-26
Location: Baltimore MD

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Subject : Curved lamination
Posted : 2011-09-24 8:32 AM
Post #36464
I need to laminate two arches for a table base, approx. 66" L X 27.75" H X 31" Radius. 2.5" X 2.5" in section. Which direction of lamination would be stronger, i.e laminating 1/8" material around a 31" radius or laminating a series of cross ply 1/8" pieces and cutting to the radius. How much spring will the radially laminated arch have, assuming I use Unibond or West System epoxy. Conversely, would a 2.5" X 2.5" section of cross ply laminated 1/8" material be stiffer?
Attached file : Arch.jpg (47KB - 83 downloads)



 
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mike mcnerney

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Subject : RE: Curved lamination
Posted : 2011-09-24 9:36 AM
Post #36465 - In reply to #36464
I think 1/8 solid stock running parallel is the stiffest. At 2.5 thick it will be like solid wood of that dimension Is this an apron? why is stiffness the most important concern. Can you put a straight piece across to stiffen? If so, bendy ply is cheaper & faster and quite stiff
with unibond.
Mike




 
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Tim

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Subject : RE: Curved lamination
Posted : 2011-09-24 12:09 PM
Post #36466 - In reply to #36465
Mike:
These are the table " legs ", hence the need for stiffness. It is a " grain " orientation question. Look at the attached JPEGS. They can explain better than I.
Attached file : Lam.jpg (37KB - 120 downloads)
Attached file : Lam2.jpg (37KB - 82 downloads)



 
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mike mcnerney

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Subject : RE: Curved lamination
Posted : 2011-09-24 2:17 PM
Post #36467 - In reply to #36466
OK all is clear now. So I go by my first recomendation. Run all in the same direction. So how can one do it the fastest & still excellent.
Look at certainly woods website. They sell thicker veneers including some 1/6, 1/10, 1/8 and lots of 1/16 in various species. You can then veneer over them with your show veneer. If you want to make it yourself my best guess is you may be able to cold bend 3/16 at that readius. How are you planning on clamping it? If in the bag you may have to go with something thinner. I'm not sure if epoxy is that ridgid,
but unibond is probably the ticket.
Mike


 
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craig tufankjian

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Subject : RE: Curved lamination
Posted : 2011-09-24 8:05 PM
Post #36468 - In reply to #36466
I agree with Mike. Certainly wood would be the way to go . the more plies the less amount of spring back . at a 1/16th you'll have 40 leaves of veneer, 20 at 1/8th.

Urea would be the way to go also due to the longer open time. I'd make a male and female form as opposed to the bag, form being 5 1/2 high so you can do both leg bases in one pressing.


 
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Tim

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Subject : RE: Curved lamination
Posted : 2011-10-12 3:28 PM
Post #36488 - In reply to #36468
Same topic different project. How much spring back could I expect from a lamination using 1/8 poplar bent on a 86" rad. form. The piece will be 5/8" thick and approx 30" L X 10" W glued with UniBond.


 
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craig tufankjian

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Subject : RE: Curved lamination
Posted : 2011-10-13 9:11 AM
Post #36489 - In reply to #36488
With such a big radius I would say no more than an 1/8th if any spring back at all.

Is it free floating or fixed?


 
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Tim

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Subject : RE: Curved lamination
Posted : 2011-10-13 1:12 PM
Post #36490 - In reply to #36489
It will be the front of a drawer box and be attached to a 3/4" front panel of the same radius.


 
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craig tufankjian

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Subject : RE: Curved lamination
Posted : 2011-10-14 10:20 AM
Post #36491 - In reply to #36490
You should be fine with what your doing. I cant see where spring back at that radius and being fixed should be a big concern.


 
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Tim

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Subject : RE: Curved lamination
Posted : 2011-11-22 2:59 PM
Post #36521 - In reply to #36491
I have delayed thinking about this for a while, but this job is next in line! I am inclined to bag it around an external form; seems more elegant with more uniform pressure. The male female form route is full of land mines, particularly if the female form is not perfect clamping pressure will not be uniform enough. On the other hand, I would think that a bag wrapping around a form will wrinkle on the inside. How do people deal with that issue, if it is an issue? One other thought was using band claps, but that will only give me enough pressure to pull the laminations to the form without the kind of pressure that bar clamps on a form would.
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