Nicholas Hall352 posts in 2103 days #1 posted 12-07-2012 01:20 AM @Danny B: A pipe clamp exerts 1050 pounds of force. The psi that it exerts is a function of the area over which that force is applied. If it is applied to a nail it will be over 10000 psi. If it is applied to 100sq inch caul it will be 10psi. The chart in the post says maple needs 1200 psi. To acheive this over a 384sq in area will require 345,000 pounds of force. My question is not how to distribute the 345,000 pounds of force. My question is how in the heck could a woodworker ever generate that much force in the first place. Here is the text from the article regarding the calculation of necessary force: “The first step when gluing boards is calculating thesquare inches of glue surface. For example, if youare gluing two boards 3⁄4 in. thick and 36 in. long, asingle glue surface equals 27 sq. in. Even if you areedge-gluing several boards, you still need to measureonly one glue surface because the clamping pressureis transmitted across the width of the boards. If youare edge-gluing flatsawn red oak boards and wish to apply about 450 lb. psi, then 27 multiplied by 450equals a force of 12,150 lb. that must be applied. Usingthe average of the editors’ clamping forces, thiscould be supplied by around nine heavy-duty barclamps, a dozen 3⁄4-in. pipe clamps, or 26 quick-gripclamps. Obviously it would be hard to fit 26 clampsalong a 36-in. board, so add some more powerfulclamps if you have them. It’s fine to mix and matchtypes of clamp. Here is a link to the article:http://www.finewoodworking.com/how-to/article/get-serious-about-clamping.aspx -- Outside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read. -Groucho Marx

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