Reply by Nicholas Hall

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

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Nicholas Hall

352 posts in 2104 days

#1 posted 12-07-2012 02:08 AM

@Pat: Just to be clear, I’m not saying that 1200psi is necessary for a strong joint in maple, or that there is any risk of glue line failure on a 4” thick glue joint. On a surface area that large, I think you could probably get away with a half a dozen harbor freight F clamps. It’s a 400 bench strong enough for a tank to drive over being used to hold a 20# board.

I am just curious how it would be possible to generate 1200 psi over 384 sq inches in the shop of a hobbiest like myself. Like I said in the post, it’s a thought experiment. Half of the posts above are arguing whether or not the calculation of the force required is correct, or whether or not clamping cauls can infinitely multiply that force through magic. The other half concede that the calculation is correct, but that it is irrelevant because you don’t actually need the optimal amount of clamping pressure recommended.

Like I said in the post, this is a thought experiment I had at lunchtime. I’m wondering how it would be possible to create the 300,000 lbs of force in my basement workshop for a few hundred bucks. I’m not arguing it’s necessary or practical. It’s just something I was trying to figure out.

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