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Q: Calculating dimensions for steel tubing for a panel press ( No Answer,   3 Comments )
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 Subject: Calculating dimensions for steel tubing for a panel press Category: Science > Technology Asked by: traveler47-ga List Price: \$100.00 Posted: 30 Oct 2006 12:37 PST Expires: 30 Oct 2006 21:11 PST Question ID: 778537
 ```I am building a panel press to glue 4? x 8? sheets of ½? plywood to a core material. For proper bonding the glue requires a pressure of 7 PSI. To exert uniform pressure on the plywood I thought to make a 4? x 8? flat matrix (= pressure plate) out of several parallel running 8? long rectangular structural steel tubes and weld four 4? long steel tubes perpendicular on top of the 8? tubes. I plan to attach a hydraulic assembly to four ?load transfer points? located on the inner two of the 4? tubes with each point exerting a pressure of 3,700 Kg for a total of 14,800 kg (7 PSI x 32 x 144). Each one of the four points would be in the center of an imaginary line running from the center of the 4x8 matrix to the four corners. This way I hope to transfer the hydraulic pressure in a rather uniform way to the 4? members, on to the 8? members and on to the plywood panel. Instead of covering the surface of the matrix with a 4x8 sheet metal I thought to rely on the structural properties of the plywood panel to give me ultimately a rather uniform pressure of 7 PSI at the glue line. I plan to over dimension the load bearing 4? members so that a little deflection could be ignored. I think this would make the dimensioning of the 8? members easier. I need the necessary formulas to assess the optimum dimensioning of the structural steel tubing and an example calculation. In addition I would certainly appreciate very much any good recommendation.```
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 ```This is not a simple problem that beam formulas would solve. I would like to take your \$100 and solve some formulas that mean nothing, but what would come closer is a finite element analysis. Maybe someone will answer and prove me wrong. I don't understand why you don't want to use a 4x8 piece of plate. Granted it will cost more, but you are already spending quite a bit of money on this project and it is certainly worth doing right. I would probably use a 4x8 sheet of 3/4 inch plate.```
 ```Thank you redhoos-ga for your quick response. I agree with you that a plate is the easiest - and in fact on the other side of the press I have already a plate. I need to go with tubing because on the plywood panels are already some fixtures installed which stick out. Bummer! I don't know how to solve "finite level analysis" problems nor do I have the software for it. Never-the-less you lived up to your image on Google-Answer for great knowledge, responsiveness and fairness. Thank you!```
 ```You scared me there for a second, I thought you were going to say that I was "fair and balanced".```