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14th May 2019, 12:06 PM #16
Thinner layers make laninating much easier especially with tight bends. Bear in mind Ikea have a full industrial setup and your going to have to do things the hard way. I would not go thicker lams than they use. I have made a few archery bows this way. As the chair frame will be subjected to a lot of stress similar to a bow only epoxy will do for glue and would be best cured in a hot box. To make the laminations you will have to get or make a thickness sander.
There is always some springback so you will have to make a couple if experimental moulds to get the angles right. I have to say there is going to be a lot of work just getting the jigs and setup ready. However its your time and it will be a learning curve.
Regards
John
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14th May 2019, 04:56 PM #17
Brisso
I am not convinced that steam bending would be an option with some of those tight curves with any solid timber. Laminating is almost certainly the way to go and as others have suggested, keep the laminations as thin as you can as it will be so much easier to work with and I believe there will be less tendency to spring back with thinner material: Consequentially less guesswork. Depending on what machinery you have available I would go less than 2mm if I could, but certainly not more.
Years ago I made a spiral staircase and the handrail was from laminated strips of Ironbark about 5mm thick (about ten of them). I would glue it up and clamp on the form using resorcinol glue (the two part stuff that looks like strawberry jam) and remove the clamps the next day. Then I would test the integrity of the join by dropping it on the ground whereupon it would spring apart like the components of an old fashioned watch. 5mm was much, much too thick. Not knowing any better in those days I gave up and used some radiata pine that I stained red.: A poor substitute.
That staircase was nowhere near as tight as your poang chair with a diameter of 1.5m. I know Silky Oak (assuming Grevillia Robusta here) is not in the same strength category as Ironbark, but those radii are a really big ask of any timber.
I would also cut some test pieces from the Silky Oak to see whether they can be bent that tight at 90degs. You will very quickly know if it is on or not.
Regards
PaulBushmiller;
"Power tends to corrupt. Absolute power corrupts, absolutely!"
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15th May 2019, 10:53 AM #18"Nothing succeeds like a budgie without a beak!" :D
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17th May 2019, 02:30 PM #19rrich Guest
Doug,
For goodness sake, please create a build thread and educate us all.
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17th May 2019, 02:31 PM #20rrich Guest
Deleted / Duplicate
Stupid BB software
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26th May 2019, 05:19 AM #21
I’ve done some tighter laminated bends than what you want but they were not weight supporting.
They were made using veneer and epoxy.
I’d suggest you source some veneer to make your footstool.
Test your bends for strength and if needed insert a piece of carbon fibre under the top and bottom layer.
H.
Sorry about the upside down pic but you get the idea.Last edited by clear out; 26th May 2019 at 05:20 AM. Reason: Typo
Jimcracks for the rich and/or wealthy. (aka GKB '88)
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