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straightening shafts?

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Pat B:
In the video of the Asian straightening the cane in an over, he is tempering as he straightens. Look at the color of the cane. Tempering stiffens the cane and makes it more compression strong. You do have to give it time to rehydrate before stressing it. The same with hardwood shoots, boo belly slats and heat treating bow bellies.    Pat

JackCrafty:
The video does show the arrow-maker heating the entire shaft, and the shaft looks dark, but I wonder if he is just saving time by heating the whole arrow and straightening all bends at the same time.  I guess he could be tempering the shafts as well.

IMO, Tempering seems like it might be a good idea for some types of flimsy bamboo (?), but I have some questions about the whole idea of tempering cane or reed:

1. When heating cane (and especially reed) if the thin outer layer gets too hot, it lifts, bubbles, and peels off.  I wonder if the cane will be heated enough to be tempered without "toasting" the outer skin of the cane.  Also, I wonder if it would be more effective to just heat all the canes in an oven, at the same time, where you can control the temperature better.

2. How do you control the effect of tempering on arrow spine?  Do you let the shafts cool and rehydrate...and then check for spine?  What if the spine is too stiff?  "Oops, there goes another arrow".  Or what if the spine is too flexible?  "Darn, now I got to heat it up again and wait another day to check this shaft".  Seems like an unnecessary hassle.  ;)

Pat B:
Patrick, I rarely even consider spine. With cane its not that critical. The natural taper will reduce the spine by 10# and I leave my shafts long(29" for 26" draw). That extra inch above the 28" standard will decrease the spine by 5#. So right there a 50# spined arrow would shoot like a 35# spined arrow
   When I heat cane for any reason; straightening and tempering, I give them time to rehydrate. They are too brittle otherwise.
   If I am not mistaken, in Asian cultures they almost always temper their cane shafts.      Pat

stringstretcher:
After the initail heating tempering/straightening, what is considered a good length of time to rehydrate?

Pat B:
For straightening I like to let the shafts cool at least over night. For tempering I give them a day or 2 before I start to make arrows from them.    Pat

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