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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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LDD
Joe is not the only one with this problem. Some, not all, my oak bowls have
done the "oval thing." Soaked the nearly fully turned bowl (turned to 1/4 inch) overnight (24 hours) in a 1:1 solution and then finished the next day. The warping is not extreme, but is enough to seriously detract. Deb Leif Thorvaldson wrote: Hi, Joe: Your experience has been the exception. I would almost venture a bet that you didn't follow "Leif's instructions" to the letter. How about sending me an email with the exact procedure you used. I generally found that there were deviations in the procedure resulting in warping or cracking. Leif "golf" wrote in message ... Howdy: I have used the Costco dish detergent as per Leifs instructions. I turned several cherry bowls, after the appropriate soaking. Immediately finishing them afterwards. None exhibited cracking. They all look nicely oval and raised up at the end grain end Joe |
#2
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LDD
Once again, we have a "bound water" versus "free water" problem. See
Hoadley, _Understanding Wood_ for some great information. Soaking _in any water-based liquid_ will preclude loss of either. Preparation of a bowl with all the centrifugal forces and heating by sanding may get rid of a lot of free water. The bound water, in contrast, is only slightly affected, as it is contained within the cells. From a purely speculative point, there being no "empirical data" that I know of, the surfactant in the detergent does what surfactants are designed to do - make the water wetter by decreasing the surface tension. As this surface tension is what promotes the capillary action which pulls water from the wood structure, it is possible that the interior of the wood remains wetter longer, while the surface appears dry by evaporation. "Dr. Deb" wrote in message ... Joe is not the only one with this problem. Some, not all, my oak bowls have done the "oval thing." Soaked the nearly fully turned bowl (turned to 1/4 inch) overnight (24 hours) in a 1:1 solution and then finished the next day. The warping is not extreme, but is enough to seriously detract. Deb Leif Thorvaldson wrote: Hi, Joe: Your experience has been the exception. I would almost venture a bet that you didn't follow "Leif's instructions" to the letter. How about sending me an email with the exact procedure you used. I generally found that there were deviations in the procedure resulting in warping or cracking. Leif "golf" wrote in message ... Howdy: I have used the Costco dish detergent as per Leifs instructions. I turned several cherry bowls, after the appropriate soaking. Immediately finishing them afterwards. None exhibited cracking. They all look nicely oval and raised up at the end grain end Joe |
#3
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LDD
Deb: When you finished turning and sanding the next day, did you
_immediately_ apply the finish? What kind? Leif "Dr. Deb" wrote in message ... Joe is not the only one with this problem. Some, not all, my oak bowls have done the "oval thing." Soaked the nearly fully turned bowl (turned to 1/4 inch) overnight (24 hours) in a 1:1 solution and then finished the next day. The warping is not extreme, but is enough to seriously detract. Deb Leif Thorvaldson wrote: Hi, Joe: Your experience has been the exception. I would almost venture a bet that you didn't follow "Leif's instructions" to the letter. How about sending me an email with the exact procedure you used. I generally found that there were deviations in the procedure resulting in warping or cracking. Leif "golf" wrote in message ... Howdy: I have used the Costco dish detergent as per Leifs instructions. I turned several cherry bowls, after the appropriate soaking. Immediately finishing them afterwards. None exhibited cracking. They all look nicely oval and raised up at the end grain end Joe |
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