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Thread: YAB-a yabba bowl...

  1. #1
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    YAB-a yabba bowl...

    My friends Helen & Scott gave me another cherry log the other day, and Helen even cut it in half for me! Here's the first blank roughed out... about to go out and start the other half. Approximately 8-8.5" initially. I really need to work on my rounding cuts on the bandsaw, it was really unbalanced when I first spun it up.

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    -Ned

  2. #2
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    Well it's round now Ned! Hope you get your heater done for your shop soon...or you'll be freezing out there when you return these.
    A man is rich in proportion to the number of things he can afford to let alone. -Henry David Thoreau
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  3. #3
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    Keep on crankin' them out, Ned.

    I typically would go with a bit thinner walls on a roughout to lessen the chance of cracking. It's always a roll of the dice until you see how much a particular batch of wood wants to move. I realize you're leaving it thick so you have enough wood to re-turn it round after it dries, but if the walls are too thick, it'll crack instead of warp. Since you have a fair amount of wood to play with, I'd suggest trying some with thinner walls and some with thicker walls. Doing so can help you find the "sweet spot" between cracking too much and warping too much.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
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  4. #4
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    YAB-a yabba bowl...

    I went with roughly 10% of the bowl diameter (gleaned from bill g's DVD) in this case it is .75 or 3/4" . I might be a shade over that... But I can easily chuck it back up tonight


    Ned
    -Ned

  5. #5
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    Nice! I love the smell of fresh cherry. Save some of the shavings for smoking ribs and such

  6. #6
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    Quote Originally Posted by Ned Bulken View Post
    I went with roughly 10% of the bowl diameter (gleaned from bill g's DVD) in this case it is .75 or 3/4" . I might be a shade over that... But I can easily chuck it back up tonight


    Ned
    Generally the 10% is a good starting point, but for a bowl that small, 3/4" walls may still be prone to cracking...it really depends on that particular batch of wood and how much it wants to move. Similarly, being a relatively small diameter, it's less likely to warp than a larger bowl. After some experimentation on both sides of that 10% number, you'll have a better feel for how that batch of wood responds. (And I corrected the suggestion in my previous post to say try some thinner and some thicker.) One of the fun (and challenging) things about drying green turned pieces is that it varies by wood species, moisture content (freshness), and of course, climate. What works for me in the desert southwest might be totally wrong for you on your side of the country. That why I'm suggesting trying a few different things to see which is better for you.
    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

  7. #7
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    Looks great Ned, and I'll second what Vaughn is saying for sure.

    One of the big mistakes I kept making when I started to roughout green bowls was to leave the base too thick, this was the source of many of my first failures at roughing, as the sides of the bowl were about right for thickness but the base was twice that or more, the sides moved a lot and cracked.

    Are you going to DNA dunk the roughed out bowls? I found with fruit wood, and maybe cherry is or is not fruit wood, the DNA bath helped a lot with the roughed out blanks NOT cracking.

    Keep at it!

    Cheers!
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  8. #8
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    Here you go guys, I re-chucked it, and fought the already moving blank into submission. I took the rim down to about 1/2" and the base is at about 3/4. I have to wait until next paycheck to pick up some DNA and a project bucket at the Borg, looking forward to accelerating the process!

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    -Ned

  9. #9
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    Looking good, Ned. Get that baby wrapped up in paper if you haven't already.

    Personal opinion, but when I stopped using the DNA bath and just started wrapping the bowls in paper, I saw no significant difference in how fast rough-outs dried or how much they moved while drying. It seems that with the DNA bath it took about 3 months for a piece to dry, and without DNA it took about 12 weeks. And I was pretty unscientific about the paper wrap. I'd wrap the bowl in three or four layers of paper, then punch a hole through the paper with my finger in the inside of the bowl to allow air to reach the inside of the bowl. (By letting the inside of the bowl dry slightly faster than the outside, it helps "pull" the wood in, which helps reduce cracking.

    Keep in mind that there are more ways of drying rough-turned bowls than there are woodturners. Try a few and see what works best for you.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

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  10. #10
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    Those proportions look a lot closer to correct to my eye.

    One other caveat is that any "square" or "sharp" edges seem a lot more likely to crack. Not sure if that's bad luck on a small sample size but it generally seems true.

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