Thursday, April 09, 2020

Rub Joint

I had the glue pot full of glue and nothing to glue. What to do, what to do. I know, do a rub joint to demo how well one works with hot hide glue. After a little scrounging around in the cutoff pile I found a short Beech cutoff that looked like it had one edge planed. I split it, slopped some hot hide glue on both edges and rubbed them together and then held it for a minute or so before setting aside.

Today I cleaned up the faces and tried to break the bond with no joy. I expect if I took a lumpy after it it would break but then with a lumpy I can break any joint.





I've started the layout of the new trestle style kitchen table and already have a head scratcher.  My stock is 8/4 and I'm trying to decide between gluing up the feet for 16/4 feet, going back to the wood store for some 4/4 stock to make 12/4 feet, or just making 8/4 feet. Right now I leaning towards 16/4 feet with 12/4 uprights.

BTW, I've marked out on one board enough feet to glue up two 16/4 feet.

ken
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7 comments:

  1. Valley Woodworker10:11 AM

    Whatever you do, I would simply make it fit my supply on hand. Or change wood species to accommodate with what you have.
    or...sacrileges, I know, take apart one bench for the wood :-)
    Solve two problems. Make room for next bench and finish table. Tada
    You're welcome :-)

    Bob, still moving boxes, shredding etc

    ReplyDelete
    Replies
    1. I'm a OK guy12:28 PM

      Bob,

      I like your thinking, now would be a great time to build a bench. I've a screw and crisscross on the shelf waiting to be used.

      ken

      Delete
  2. Matt McGrane10:38 AM

    One thing I thought about with rub joints is this. If the joint is more than a few inches long (say for example, for a glued up table top), how do you ensure the boards don't get misaligned in the thickness direction? Not sure if this question is clear. After rubbing the joint and getting it to tack, is there still some ability to correct that alignment without breaking the vacuum of the rub joint?

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    Replies
    1. I'm a OK guy12:38 PM

      Matt,

      You have time to get everything aligned after you rub the joint together. The joint isn't held together by vacuum but by the glue bonds with the wood. If I were doing a big glue up I'd lay the wood out on cauls to keep it aligned even though clamps are not needed.

      ken

      Delete
  3. Sylvain6:54 AM

    Not really vacuum but to separate the two pieces you would have to allow air to come in the joint. There is a "suction cup" effect with atmospheric pressure pushing from outside.
    By the way, a submarine in good contact with the sea-bottom might be unable to leave the sea-bottom. I have once seen the demonstration on TV. They had taken a wooden board and rubbed it on the bottom of an aquarium. The board would remain on the bottom as the water pressure would only act from above.
    Sylvain

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    Replies
    1. I'm a OK guy2:21 AM

      Thanks Sylvain, a better answer than mine.

      ken

      Delete
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    ReplyDelete

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