Extra Pressure From Your Clamps – 360w360 E.178

clampheadsIn this episode of 360 with 360WoodWorking, the 360 guys talk about how to get the most out of your clamps.

Join the guys twice each week for six lively minutes of discussion on everything from tools to techniques to wood selection (and more). Chuck & Glen, and sometimes a surprise guest, all have their own opinions. Sometimes they agree and sometimes they don’t, but the conversation is always information packed and lots of fun.

If you have topics you’d like to hear covered in future episodes, click here to send an email to the guys.



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7 thoughts on “Extra Pressure From Your Clamps – 360w360 E.178

  1. Because most clamps lock by pivoting and the moving end of the pad is often higher and smaller there could be more force concentrated at that end. Or not.
    The real lesson is to be learned- let the #*#* phone ring. Oh yes and – use hide glue.
    Thanks Don

  2. Clamps exert force. http://theydiffer.com/difference-between-force-and-pressure/

    Not to get pedantic, but as a one-time physics major, I guess I fall into the “engineers are…”

  3. Let me start by saying how much I like the work that you guys do in reproduction furniture. Gorgeous pieces and finishes to match.

    While I have no doubt that some types of clamps will do this, I think it would be due to the swivel or looser jaw on the driving end of the clamp. Or from releasing and reapplying the pressure. I wish I had seen this before the CVSW open house last weekend, I would have definitely brought up the topic.

    All of the force in the clamp is contained in the bar. If you push on one end of the bar with 500 lbs, the other end can’t resist with only 450 or whatever. It can’t even have 499 lbs., no matter is there are “fulcrums” in the threads.

    Why haven’t you developed a line of clamps that have screws on both ends, having this knowledge. It seems like you are cheating the world.

    Seriously, I had to check the date on this post to see if it was 4/1. Or more likely 4/20

    Thanks for the info,

    1. Steve,

      I wish you would have brought it up too. I think the problem we had in the podcast is more one of nomenclature than anything else. If I follow the non-pedantic Keith, you are correct in that the clamp exerts the same lbs/in² (or whatever units you choose, or are appropriate) at both ends of the clamp, given that both pads are approximately the same size. However, the force exerted may not be the same. For example, if I take a 1″ X 6″ X 48″ board, stand it on end and loosely clamp it to the edge of my bench, while resting one end on a 1″ cube of steel, then strike the opposing end with a hammer (with roughly a 1″ square face), I’m apt to get two different size dents in the ends of my board. The deeper dent occurs where the hammer meets the wood, while the square block leaves a lesser dent. From what I understand, this is because the force dissipates, and is absorbed by the wood. At the moment of impact, the pressure is the same at both ends, but the force is stronger at one end. So, I guess this is a convoluted way of saying, “Use the Force, Steve.”

  4. “In God we trust; all others bring data.” – W. Edwards Deming.

  5. By far & away, the best tip 360 has provided.
    NOWHERE ELSE on the web, will you get secret information like this.
    (I’ve actually experienced this, but it happened when I didn’t have enough room to grab the handle properly and turned the clamp around, and re-tightened it and found more pressure.)
    Another example why you guys are NEVER going to get rid of me as a subscriber for as long as you guys drive this 360 bus !

    1. Another example why you guys are NEVER going to get rid of me as a subscriber for as long as you guys drive this 360 bus !

      No matter how hard we try. 🙂

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