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Thread: dna help

  1. #1
    Join Date
    Mar 2008
    Location
    bethel springs TN, but was born and raised in north east PA
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    3,132

    dna help

    Hey all
    I don't know if it's me or just the nature of the beast,but
    i've been trying to turn green wood.it seems like every time
    it still cracks.I'll cut down a tree cut it into some blanks, ruff
    turn something,put it in the dna for 3or4 hours,take out,put it
    a paper bag,and by the next mourning it all ready has started to
    crack.Now i've ben using oak just becouse i have 6 1/2 acres of it
    and it's just practice. Here's a pic of the latest vase and yes it cracked to.
    Steve
    Attached Thumbnails Attached Thumbnails 100_0754 (Small).jpg  

  2. #2
    Join Date
    Oct 2006
    Location
    ABQ NM
    Posts
    30,002
    Steve, I don't think 3 or 4 hours is nearly long enough. Most folks soak it for at least 24 hours. I often leave it longer than that, since I tend to forget the piece is in the bath.

    Try a longer soak and see if that helps. Also, how thick are you leaving the sides of the pieces? If they are too thick, it's more likely the piece will crack. In general, a wall thickness of about 10% of the diameter is a good rule of thumb.

    I hope this helps -
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  3. #3
    Join Date
    Mar 2008
    Location
    bethel springs TN, but was born and raised in north east PA
    Posts
    3,132
    Vaughn
    thanks I don't know where i thought i seen that time line but i'll
    defintely try letting it sit for at least 24 hours and maybe that will
    do it. I thought maybe it was the oak.O well that's what i get for thinking.
    Buy the way i try to hollow it down to at least 1/2 inch.
    Steve
    Last edited by Stephen Bellinger; 07-16-2008 at 10:47 PM.

  4. #4
    Join Date
    Dec 2006
    Location
    Goodland, Kansas
    Posts
    4,834
    Stephen I soak in DNA for at least 48 hrs up to 72 hrs for bowls and lidded boxes. I have left them in for a week when I forgot with no problems. I generally don't soak HF's. I take them from the block right to the finished product. I think soak them in Antique Oil or Danish Oil till they won't soak anymore in. I wait 24 hrs and do it again. Then one more time for a 3rd coat. I let it dry for a week and then buff. I haven't lost one to a crack yet.
    Bernie W.

    Retirement: Thats when you return from work one day
    and say, Hi, Honey, Im home forever.

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  5. #5
    Join Date
    Mar 2008
    Location
    Remlik, Virginia
    Posts
    88
    First of all if you have not read the original information you should. Because you say you are putting the piece in a paper bag I think maybe you have not yet read the original information.
    http://www.woodcentral.com/cgi-bin/r...cles_473.shtml

    I believe Dave suggests turning the rough outs (bowls) thinner than the general 10%. I have found that hollow forms should be even thinner. As was said, too thick=cracking. The only pieces that have cracked for me were too thick.

    Oak is difficult no matter what you do.
    Barbara

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