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Question about green log approach (Read 606 times)
 
Ian Tyndall
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Question about green log approach
May 8th, 2017 at 8:47am
 
Hello,

I have 12' diameter white oak logs in varying lengths - up to 8 feet long.

I would like to try to turn a large bowl with the logs.  What is the best approach for doing this:
1) Should I cut the logs in half down the middle (split them vertically)
2) Should I cut them at bowl depth and align the center with the center of the log (cut them only horizontally)?

Thanks for your insights!
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Ed Weber
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Re: Question about green log approach
Reply #1 - May 8th, 2017 at 8:52am
 
Ian, this may help you visualize where you want to cut.
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Grant Wilkinson
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Re: Question about green log approach
Reply #2 - May 8th, 2017 at 9:03am
 
Since you didn't mention it in your post, I'll add a comment about sealing the logs. Your subject line says they are green. If you aren't going to turn them very soon, leave them long and seal the ends with a commercial log sealer or latex paint. Once you cut them into bowl size lengths, they will start to dry and likely start cracking.

Ed's document is a good resource for the various ways to can get bowl blanks from logs. If I understand you second option, you are talking about "end grain bowls". With that type of bowl, the grain of the log is running parallel to the ways of the lathe when the blank is mounted - like spindle turning. The pith is close to the center in the bottom of the bowl. Since many (most) cracks will emanate from the pith, you will likely need to do something to seal the pith. FWIW, I've had reasonable luck flooding the pith from inside and outside of end grain vases with thin CA glue. If you are new to bowl turning, (I'm no expert, for sure.), I would suggest you stay away from end grain pieces for a while. They are more difficult to turn and pith sealing can be a hit or miss experience.
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Grant Wilkinson
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Ian Tyndall
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Re: Question about green log approach
Reply #3 - May 8th, 2017 at 10:34am
 
Thank you - great resources
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Don Stephan
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Re: Question about green log approach
Reply #4 - May 8th, 2017 at 6:34pm
 
If you like videos Reed Gray (Robo Hippy) has one on his Youtube channel about making bowl blanks.
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John Cepko
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Re: Question about green log approach
Reply #5 - May 12th, 2017 at 6:37pm
 
I cut the logs the same length, plus an inch or so, as the diameter of the big end.
A 12" diameter log would be cut about 13" long.
I may rip the log in half lengthwise first, then cut to length. It is easier to rip longer logs so you are not bouncing off the end grain.
Once they are cut, either turn them, or seal them. Once the logs start to crack, it is hard to stop.
With a stack of 8 foot logs, I would only cut what I could rough turn in one day. Seal both ends of the big log, and just cut and seal one end.

Be sure to clean the wet Oak shavings from the lathe and tools when you are done.. Oak has a way of rusting steel like few other woods.
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Ian Tyndall
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Re: Question about green log approach
Reply #6 - May 17th, 2017 at 9:36am
 
You were right about the rust!  I left a form on a faceplate overnight and it rusted that quick!
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george dolak
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Re: Question about green log approach
Reply #7 - Oct 7th, 2017 at 11:56am
 
Ed Weber wrote on May 8th, 2017 at 8:52am:
Ian, this may help you visualize where you want to cut.
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I am a newby also and the pdf you linked is a great help.  Thanks, Geo
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Ed Weber
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Re: Question about green log approach
Reply #8 - Oct 7th, 2017 at 12:55pm
 
We have many helpful articles and videos here.
Just click on Tutorials, Projects and Tips (TPT) at the top of the page.
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