Sunday, April 12, 2020

Rub Joint Revisit

It has been a couple of days since I made the demo rub joint so it is time to destroy it. I took the lumpy and a block of wood to the joint and as expected after 3 or 4 hard wacks with the lumpy the wood failed. The joint is still strong. The results would be the same with any modern wood glue so that part is no big deal.

This is with 192 gram strength glue instead of 253 gram strength, I can see no reason to go stronger than 192.





Another view:




Click 'em to big 'em, if you do you can see the glue line and the break of the wood.

ken
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10 comments:

  1. Ralph Boumenot1:41 PM

    Ditto on the 253. I tried it because I thought higher had to be better. What I found out was the 253 set up too quick on me.

    ReplyDelete
    Replies
    1. I'm a OK guy2:48 PM

      Ralph,

      That is an easy assumption. Some sellers recommend 253 for cabinet construction, it ain't needed for normal use.

      ken

      Delete
  2. Sylvain3:10 AM

    Hide glue gram strength is some kind of viscosity measure and is not related to the joint strength. look at Patrick Edwards video:
    https://www.finewoodworking.com/2020/03/20/choosing-and-mixing-hot-hide-glue
    at about 6'30"

    recommendation at 14'50".
    Sylvain
    Sylvain

    ReplyDelete
  3. I'm a OK guy7:12 AM

    Sylvain,

    As usual, you are correct once into the higher gram strength. It is mostly about working time.

    ken

    ReplyDelete
  4. Valley Woodworker12:42 PM

    Learned something new, diff between 192 vs 253 grams strength
    Cool

    Bob, reading lots of historical stuff on line

    ReplyDelete
  5. I'm a OK guy4:48 PM

    Bob,

    Between Sylvain and myself we have the answers :-). There is not a lot of good information on hide glue, a lot of misinformation but that is the case with most things wood. The WPatrick Edwards videos are some of the best I've found, he knows hide glue.

    Ms.Bubba, aka the slave driver, has kept me too busy to read much. I may have to go back to work to get some rest.

    ken

    ReplyDelete
  6. Sylvain3:16 AM

    "I may have to go back to work to get some rest."
    Aha. That reminds me an "argument" heard in discussions about flight/duty time and rest time in the aviation world.
    Sylvain

    ReplyDelete
  7. Valley Woodworker6:42 AM

    8 hrs of sleep between flight.... sure :-)
    Bob

    ReplyDelete
    Replies
    1. I'm a OK guy1:26 PM

      Let's see the 8 hours starts when you walk off with your flight bag. Of course the fist step after that is dealing with the FBO for ten fifteen minutes, another 15 minutes wait for either getting a crew car or transportation to the hotel. Thirty minute trip to the hotel, 30 minutes to check in and another 30 minutes to get a bad sandwich in the bar because the kitchen is closed. So far you are down to 6 1/2 hours for "rest" except you have to repeat the process back to the airport. You are lucky to get 4 hours of rest out of the 8 hours required.

      ken

      Delete
    2. I'm a OK guy1:28 PM

      I'm sure Bob's BTDT too many times to count.

      Delete

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