LumberJocks

Reply by dbhost

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Posted on How Much Pressure Is TOO Much?

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dbhost

5726 posts in 3257 days


#1 posted 06-14-2012 06:12 PM

I have both Jorgensons, and HF clamps. Both will let me dent hardwoods during glue ups if I try my gorilla impression with them… I am still stunned at the guys that claim the HF clamps won’t hold enough clamping force. I think they are trying to accomplish a wood to wood bond by driving the fibers together with clamping force…

I may be wrong, but I honestly think if you are applying enough pressure with the clamp to cause the clamp to flex, you are doing something very wrong…

I think on the question of how much it too much or not enough, I was taught by the late Dee Smith (my Jr. High wood shop teacher), that you wanted just enough pressure, applied evenly, to get a slight bit of squeeze out. If you are denting the wood, chances are excellent you have forced all the glue out of the joint. He demonstrated that gluing together a couple of scraps of 2×4, one set hamfisted, the other with just enough pressure to barely squeeze out. This was back in the day I think the only wood glue I had heard of was Elmers Wood Glue… The following day’s class he showed how slight a pressure with a screwdriver popped apart the hamfisted joint, but he couldn’t get the light squeeze out joint apart with a chisel and mallet… That lesson has stuck with me all these (mind your own business on the # of) years…

I am sure that there is an engineer on this board somewhere that can chime in with #s, and let me stand aside while that happens… Engineers and their numbers bore me to tears. Nothing personal, I just work with them and see them always take the long way around a simple problem…

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