Poplar ply - any good? |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Thanks for the link snowflake! Just what I'm after. With proper bracing, "just" 9mm of poplar ply can exceed the stiffness of 24mm birch plywood in cabinet. Add a CF/GF skin to that and you're fixing that wear resistance Nb. 'Proper bracing' involves multiple rounds in FEM analysis & isn't a walk in the park. With guessing the bracing, you can go surprisingly far though. Edited by infrasound - 17 February 2021 at 6:16pm |
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 515 |
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Why send all the time and work to make custom speaker cabs and use cheapie ply??? The best I have found is "Finland" 3/4" 4 x 8 foot 100 % birch exterior...........Like a Rock....
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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the good poplar isn't cheap - if anything it's more expensive than birch. |
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VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 515 |
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I am basing My choice of Finland 4 x 8 sheets as to what is stocked in Maine USA. The Poplar cored ply here has very thin Birch outer layers and is not water proof. Sort of soft too. Go Finland. Like a Rock.
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stevie
Registered User Joined: 16 March 2008 Location: Dorchester Status: Offline Points: 425 |
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How exactly did you reach that conclusion?
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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deflection of a panel is proportional to the width^3 and inversely proportional to the thickness^3.
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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FEA and some physical validation
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stevie
Registered User Joined: 16 March 2008 Location: Dorchester Status: Offline Points: 425 |
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And did all this FEA and physical validation result in a commercial product?
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Nope, only for personal toys
IMO it would be hard to commercialise, specifically due to the cost, assembly complexity, tolerance, wear and definitely overall strength. I'm happy to manage these personally, but wouldn't scale well upwards from there
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