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Posted on Are Most Benchtops Woefully Underclamped during Glueup? (probably not)

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casual1carpenter

353 posts in 1141 days


#1 posted 12-07-2012 08:19 PM

@Nicholas Hall “In my case I’m doing a 4” thick by 96” long top, so the total square inches of glue face is 384 sq inches. The boards I have are flatsawn, with the flatsawn faces in the glue joint. I’m using ash, which is most similar to red oak in density and grain structure, so we look at the chart and see that I need 900 Pounds Per Square Inch (PSI) in order to get the recommend clamping preassure. That means I need to exert 345,000 pounds of force in order to get the recommended 900psi distributed across the glue joint (900psi * 384 sq inches). Further in the article, the author shows that the average woodworker can extert 1050 lbs of force with a 3/4 inch pipe clamp (which is what I’m using). Luckily I have 10 pipe clamps already, so that gets me 10,500 pounds of force. Now I just need to find 335 more sets of pipe clamps and devise a way to get them mounted on the wood. Are most workbenches woefully under-clamped during glue-up?

Considering an Abrams main battle tank weighs in at about 60.4 long tons, one would have to stack and balance 3 tanks atop a 4” thick by 96” long glue up, perhaps one or two could be without ammo. I’m sorry but something is not making sense here.


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