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A case for rehydrating... (Read 435 times)
mike jones
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A case for rehydrating...
04/14/12 at 17:28:11
 
Many years ago, when I first stuck a toe into the "vortex", on a funky old lathe and with a Harbor Freight tool set, there was no forum like this...no internet, and for me, no mentor or club. As you might suspect, I did many things "wrongly". Drying rough turned bowls was no exception and I started a collection of excessively warped (reject) bowls.

In my naivete, I reckoned that if a round wet one would go oval in drying, an oval dry one would go round in soaking, and I soaked a few. Yep.  They would go round again!  Some of those allowed me to re-turn to a thin wall and the warpage on the second go round was not as bad.

The next step was a natural progression.  If I would glue a rim of a different wood to the re-wetted and re-turned bowl,  the tendency to warp was resisted by the differing grain of the glued up, added rim.

Someone, somewhere, sometime, might give rehydrating a try instead of delegating a reject to the burn pile.  Not much to lose, right?  And, there is an article in the latest issue of The American Woodturner that features added rims of contrasting colors that reminded me of what I was doing so long ago...when I didn't know better.

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Scott glass
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Re: A case for rehydrating...
Reply #1 - 04/14/12 at 19:22:04
 
We learn from our mistakes and sometimes they are even better than if no mistake at all. One time I hit the corner of one of skews and a very small chip. In trying to bring the edge back I had made a slightly rounded skew which I find helpful sometimes, I still have a normal skew to. I might try your idea out once to see what happens.
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Bernie Weishapl
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Re: A case for rehydrating...
Reply #2 - 04/15/12 at 06:43:21
 
I guess I had never thought about soaking a bowl in water. I always leave the walls rather thick (3/4" for 10" bowl or smaller and 1" to 1 1/2" for larger bowls) so they can be re-turned with no trouble. I have never had one that I could make round after drying. I have did a few bowls with a glued on rim but have always made sure the grains match or your glue joint won't hold for long. The article also stresses that you match the grains.
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Bernie
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mike jones
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Re: A case for rehydrating...
Reply #3 - 04/18/12 at 16:26:32
 
It's academic here, but I took issue with the Joshua Friend article on a couple of accounts.  Surely, if non-matching grain joints were weak, segment turners would be in a lot of trouble. And, the amount of movement from ambient humidity would be very small even if the wood was not well sealed.
I further believe that if a turner has the skills to make a simple lidded box, he/she would also have the skills to make a rabbeted or mortise & tenoned joint between the bowl body and rim.

It could be noted here also, that those pesky rim cracks, which can plague even seasoned turners, can be turned away and the bowl reinforced by an add-on rim. Rehydrating
makes that process easier and the finished product more predictable.

It's fun to talk about anyway...  Smiley    beer
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Ron Sardo
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Re: A case for rehydrating...
Reply #4 - 04/18/12 at 16:51:08
 
mike jones wrote on 04/18/12 at 16:26:32:
Surely, if non-matching grain joints were weak, segment turners would be in a lot of trouble.



A lot of them find their pieces falling a part after a few years if they didn't take into account grain direction.
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