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Methods of drying green wood (Read 325 times)
 
Luke Owens
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Methods of drying green wood
Oct 25th, 2017 at 12:43pm
 
Hi guys, for science I am doing a year long independent study project and Im choosing to do the different methods of drying rough turned bowls, how they react to drying. I need as many methods to dry green wood/rough turned bowls as possible for my independent variable. I already know about denatured alcohol, paper bag, and anchor seal method. The more the merrier though right?
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« Last Edit: Oct 25th, 2017 at 7:35pm by Luke Owens »  
 
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Clark Pittman
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Re: Methods of drying green wood
Reply #1 - Oct 25th, 2017 at 5:19pm
 
Luke,

I've never tried it but how about microwave oven drying.

Good luck with the study, there will be a lot of us interested in your results.


Clark
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Don Stephan
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Re: Methods of drying green wood
Reply #2 - Oct 25th, 2017 at 7:19pm
 
Your post doesn't indicate if you are drying lumps or rough turned or finish turned bowls.  And of course different woods have different tangential and radial shrinkage rates.  Finally, my experience with a few woods is that some, like beech and eastern redbud, are plain ornery and more unpredictable as to cracking.
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Luke Owens
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Re: Methods of drying green wood
Reply #3 - Oct 25th, 2017 at 7:35pm
 
Just to clarify I will be doing this project through rough turned green bowls.
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Tom Coghill
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Re: Methods of drying green wood
Reply #4 - Oct 26th, 2017 at 10:09am
 
Luke - I have done a lot of Microwave drying of our white Birch wood here.  I found that it works, but it can also discolor the wood - appearing darker yellow in some areas.  Typically I would microwave the bowl (about 6 inch diameter) for 60 to 90 seconds then let it cool for 2-3 hours.  I would repeat this (shortening the cook time as the moisture goes away).  Photo results below
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Ed Weber
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Re: Methods of drying green wood
Reply #5 - Oct 26th, 2017 at 10:38am
 
Luke Owens wrote on Oct 25th, 2017 at 12:43pm:
Hi guys, for science I am doing a year long independent study project and Im choosing to do the different methods of drying rough turned bowls, how they react to drying. I need as many methods to dry green wood/rough turned bowls as possible for my independent variable. I already know about denatured alcohol, paper bag, and anchor seal method.


I don't know what particular area of study you are aiming at but one of the first things is to find out if the work has been done before. The artificial or forced seasoning of wood has been around tor thousands of years.
Google search "METHODS OF ACCELERATING WOOD DRYING by Leif D. Espenas"
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« Last Edit: Oct 26th, 2017 at 10:52am by Ed Weber »  
 
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Arlin Eastman
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Re: Methods of drying green wood
Reply #6 - Oct 26th, 2017 at 3:02pm
 
I know some guys who have taken an old Fridge and stripped out everything but the shelving and put a light bulb and thermometer in the side with a vent hole on top which can be open or closed to dry their wood faster but to keep it at a steady rate to keep it from cracking.
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Tom Coghill
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Re: Methods of drying green wood
Reply #7 - Oct 26th, 2017 at 3:43pm
 
Luke - re-reading your specific question, which is "how do rough turned bowls react to drying".

Honest Answer:  If just left on their own - they crack.  If you take ample precautions, they might crack or they might not.

I think we are done here .... Thumbs Up

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Ed Weber
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Re: Methods of drying green wood
Reply #8 - Oct 27th, 2017 at 8:49am
 
Luke Owens wrote on Oct 25th, 2017 at 12:43pm:
Hi guys, for science I am doing a year long independent study project and Im choosing to do the different methods of drying rough turned bowls,


Tom Coghill wrote on Oct 26th, 2017 at 3:43pm:
Honest Answer:  If just left on their own - they crack.  If you take ample precautions, they might crack or they might not.

Although Tom may make it sound like a simple answer, it's not that easy.
The question isn't whether they do or don't crack, it's how they react to different drying methods.
Air Drying, Kiln Drying, Chemical, Vacuum, Steam, etc.
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robo_hippy
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Re: Methods of drying green wood
Reply #9 - Oct 30th, 2017 at 11:08am
 
It is a highly variable situation, depends a lot on which wood you are drying, and what your local environment is like. Too dry of an environment and you have to 'contain' the wood so it doesn't dry too fast. Too wet of an environment and you need a slight heat source or the wood rots. Personally, I like once turned warped bowls. Here in the Pacific northwest, a 1/4 inch thick bowl is dry in about 10 days max.

robo hippy
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Len Mullin
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Re: Methods of drying green wood
Reply #10 - Oct 30th, 2017 at 10:22pm
 
Luke, don't forget to try the Costco liquid soap drying method, I wonder how it will work?
Len
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robo_hippy
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Re: Methods of drying green wood
Reply #11 - Nov 2nd, 2017 at 4:46pm
 
The soap mix, which I use on just about every bowl I turn, makes pieces much easier to sand out. My bowls are once turned, then I let them dry and warp before sanding. With some experimenting, the DNA (denatured alcohol), LDD/soap soak, and air drying all worked at the same speed with the same amount of warping and cracking. Only difference was that the soap soaked was easier to sand out, and the DNA was harder to sand out. There could be differences when doing twice turned bowls, but I never tried them out.

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Len Mullin
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Re: Methods of drying green wood
Reply #12 - Nov 2nd, 2017 at 10:19pm
 
Hippy, what brand and type of soap did you use? I've read that it had to be Costco brand liquid dishwasher soap, I don't know why or how they figured that one out.
Len
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Don Stephan
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Re: Methods of drying green wood
Reply #13 - Nov 3rd, 2017 at 8:14am
 
Len

Some discussion of free and bound water, and differences in moisture content of sapwood and heartwood, found in R Bruce Hoadley's Understanding Wood, might be relevant and interesting.  It is a great all around reference book for anyone who works with wood.
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Ed Weber
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Re: Methods of drying green wood
Reply #14 - Nov 3rd, 2017 at 8:34am
 
robo_hippy wrote on Nov 2nd, 2017 at 4:46pm:
Only difference was that the soap soaked was easier to sand out


Maybe because it's acting like an additional stearate, which makes sanding easier and helps resist loading of the abrasive.

Google "stearated sandpaper"
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