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Old 09-17-2010, 03:26 PM   #1
TheAikidoka
 
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Dojo: Tenshinkan Dojo UK - mid sussex martial arts school
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Warping

Anybody have any ideas how to correct warping of weapons? Ive had a Jo for about three years, its my favourite Jo (I have two others) left it outside whilst I went on holiday (stupid I know!) now its wapred at one end and does not lie flat on the floor. Also its weired training with a warped Jo, I can really feel it when practicing suburi. Any help would be great thank you

Andy B
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Old 09-17-2010, 03:37 PM   #2
chillzATL
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Re: Warping

http://kingfisherwoodworks.com/warr.maint.html

keep in mind this is based on their appalachian hickory weapons and not all types of wood bend like that.
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Old 09-17-2010, 05:37 PM   #3
TheAikidoka
 
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Re: Warping

Thank you for that post jason will check more of it out when I get back from work. My Jo is is made of Shiro kashi, Japanese white oak.]I will try the bending in the tree trick though ;-)
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Old 09-17-2010, 09:21 PM   #4
lbb
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Re: Warping

I've never heard of un-warping a white oak jo, but maybe it can be done. The Kingfisher site has great advice on avoiding warping in the first place. In addition to what they say, I have been advised not to store a jo in an upright position or on those two-points-of-contact weapons racks that are so popular. My jo lie flat on the floor whenever I'm not using them. The one jo that I foolishly left leaning against the wall in a corner warped -- another one that I have never stored improperly is still straight as a ruler after 15 years.
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Old 09-18-2010, 05:33 PM   #5
Krystal Locke
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Re: Warping

Reverse the process. Build a straight jig, with extra support around the warped point, force the wood into the jig, and steam it for a while. Repeat as necessary, the wood will partially relax back into the warp a few times.
I used that method to put a warp/sori into a homemade bokken, worked a treat. Didn't want to cut across any appreciable amount of grain.
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Old 09-19-2010, 05:15 AM   #6
TheAikidoka
 
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Re: Warping

Well Ive tried a variation on the method Jason posted, I stuck one end of the Jo in between two upright branches of a ewe tree I have growing in my back garden, and stuck the other end in another ewe tree growing about 2 feet beside it, I bent the Jo so it had a good arc, 24 hrs later hey presto my Jo is straight!!!! thank you Jason and everyone who has given some good advice. I wont be leaving it outside again ;-)

Andy B
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