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

 
Subject : Weight reduction for thick pannels
Posted : 2002-06-28 1:03 PM
Post #29227
I am designing a chair in the modern classic or "cubist" style using 1 1/8" to 1 1/2" thick, flat veneered pannels for the sides and back rest. I built a model using 2 layers of 3/4 MDF for the pannels and not applying the veneer yet to see how the chair fits. When cunstruction was complete, the chair was perfectly comfortable, but I feel it was much too heavy and would be cumbersome to move. The side pannels are roughly 28" x 23". the back rest is approx. 27" x 30" I was affraid to sandwich spacers between 1/2" mdf because I felt it would not be as strong or the weight reduction would not add to much. Is there a technique,process, or product that I'm not thinking of or aware of that would reduce the weight of thick pannels? Thankyou in advance to anyone who can help.



 
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John Randazzo

 
Subject : Weight reduction for thick pannels
Posted : 2002-06-29 8:39 AM
Post #29232 - In reply to #29227
: I am designing a chair in the modern classic or "cubist" style using : 1 1/8" to 1 1/2" thick, flat veneered pannels for the sides and back : rest. I built a model using 2 layers of 3/4 MDF for the pannels and : not applying the veneer yet to see how the chair fits. When : cunstruction was complete, the chair was perfectly comfortable, but I : feel it was much too heavy and would be cumbersome to move. The side : pannels are roughly 28" x 23". the back rest is approx. 27" x 30" I : was affraid to sandwich spacers between 1/2" mdf because I felt it : would not be as strong or the weight reduction would not add to much. : Is there a technique,process, or product that I'm not thinking of or : aware of that would reduce the weight of thick pannels? Thankyou in : advance to anyone who can help.Brian, Provided you have a vacuum press, you could make these panels as torsion box construction. Make a frame to watever size you need and set onto a piece of 1/4 mdf, be sure to put blocking wherever needed for joinery or fasteners, then fill in the void with resin imprgnated honeycomb cardboard, wich is available through this website. Once you have everything cut to fit, spread your glue, place another piece of 1/4 on top and press the whole thing. It,s sometimes difficult to explain everything on this forum, but I think you get the picture. Good luck, John




 
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Brian Sanders

 
Subject : Weight reduction for thick pannels
Posted : 2002-07-01 9:47 PM
Post #29240 - In reply to #29232
: : : I am designing a chair in the modern classic or "cubist" style using : : 1 1/8" to 1 1/2" thick, flat veneered pannels for the sides and back : : rest. I built a model using 2 layers of 3/4 MDF for the pannels and : : not applying the veneer yet to see how the chair fits. When : : cunstruction was complete, the chair was perfectly comfortable, but I : : feel it was much too heavy and would be cumbersome to move. The side : : pannels are roughly 28" x 23". the back rest is approx. 27" x 30" I : : was affraid to sandwich spacers between 1/2" mdf because I felt it : : would not be as strong or the weight reduction would not add to much. : : Is there a technique,process, or product that I'm not thinking of or : : aware of that would reduce the weight of thick pannels? Thankyou in : : advance to anyone who can help.: Brian, Provided you have a vacuum press, you could make these panels as torsion box construction. Make a frame to watever size you need and set onto a piece of 1/4 mdf, be sure to put blocking wherever needed for joinery or fasteners, then fill in the void with resin imprgnated honeycomb cardboard, wich is available through this website. Once you have everything cut to fit, spread your glue, place another piece of 1/4 on top and press the whole thing. It,s sometimes difficult to explain everything on this forum, but I think you get the picture. Good luck, John Thankyou for your advise John. I will try a torsion box this week. As for the honeycomb, I have looked for suppliers and have only found two. I like to have many suppliers to choose from if needed. Other than this web-site, do you know a company or two that keeps this stuff in stock.




 
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John Randazzo

 
Subject : Weight reduction for thick pannels
Posted : 2002-07-01 11:29 PM
Post #29241 - In reply to #29240
: : : : : I am designing a chair in the modern classic or "cubist" style using : : : 1 1/8" to 1 1/2" thick, flat veneered pannels for the sides and back : : : rest. I built a model using 2 layers of 3/4 MDF for the pannels and : : : not applying the veneer yet to see how the chair fits. When : : : cunstruction was complete, the chair was perfectly comfortable, but I : : : feel it was much too heavy and would be cumbersome to move. The side : : : pannels are roughly 28" x 23". the back rest is approx. 27" x 30" I : : : was affraid to sandwich spacers between 1/2" mdf because I felt it : : : would not be as strong or the weight reduction would not add to much. : : : Is there a technique,process, or product that I'm not thinking of or : : : aware of that would reduce the weight of thick pannels? Thankyou in : : : advance to anyone who can help.: : Brian, Provided you have a vacuum press, you could make these panels as torsion box construction. Make a frame to watever size you need and set onto a piece of 1/4 mdf, be sure to put blocking wherever needed for joinery or fasteners, then fill in the void with resin imprgnated honeycomb cardboard, wich is available through this website. Once you have everything cut to fit, spread your glue, place another piece of 1/4 on top and press the whole thing. It,s sometimes difficult to explain everything on this forum, but I think you get the picture. Good luck, John : Thankyou for your advise John. I will try a torsion box this week. As for the honeycomb, I have looked for suppliers and have only found two. I like to have many suppliers to choose from if needed. Other than this web-site, do you know a company or two that keeps this stuff in stock.Brian, I,m sorry, but Darry is the only person I buy this product from, however, if you can't find another supplier for this product, then another thing you can use is a product called gatorboard, it's styrofoam coverd on both sides with a heavy paper and works just as well. I dont know what the price difference is, but I know that Darryl stocks the honeycomb. Regards, John.




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