I'm Designing a peice of furniture and have reached a problem with its structure. I need some advice by some one with knowledge of matterial strengths to advise me on joining two sheets of material. Can any one help?
I will be more specific then. I'm trying to join two sheets of 18mm thick poplar plywood board together at 90 degrees. it needs to be mega strong but not be any thicker than the 18mm. I thought of dovetail joints but i can add components to make it stronger. additional components could be used.Where can i get free advice from a structural engineer?
the strongest joint you can make between 2 sheets of plywood at 90 degrees would be either a comb joint or a dovetail joint. Depending of which direction the forces are applied where the strength would be needed. the other options would be either a formed metal corner that the 2 ends of ply are bonded into. or if it doesn't need to be a square 90 degree corner make up the bend in lamination Incorporated into the sheet (that is make a sheet of ply with a tight bend in it)
if you need me to be more specific e-mail me directlyWhere can i get free advice from a structural engineer?
If in uk, askyourneighbour.com they have advisors for different catagories, like here but less busy and more local.
Would you ask a builder to build for free.. no. would you ask a vet to fix your pet.. no you wouldnt now go and bleedin pay them!!
You can use a number of combinations of braces and brackets to fasten the plywood together. You can browse the website below for various brackets that might work for your application.
Honestly... you need advice from a furniture maker not a structural engineer. go to a woodworking forum/board...check out.. http://www.samallen.com/
or http://www.woodnet.net/links/
Plywood is very strong in shear and has very good compression strength, but it might not hold up if you try to dovetail the edges like that depending on the loads it will see. Personally, if you can stand having a corner bracket, thats what I'd do. If you can't, then use a really good structural adhesive. In the states, adhesives like Liquid Nails are available.
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