Main Discussion Area > Arrows
Spine question
willie:
I cannot remember why, just that it's what I do. Perhaps it does not matter which side gets reduced, but we seem to prefer to do reductions on our bows on the compression side, so maybe just a force of habit?
Aaron H:
I would think that with bamboo, the difference in stiffness lies in the uneven wall thickness.
Maybe try an experiment on a particular shaft where there is drastic difference in stiffness from one side to the other, mark the stiff side, then cut the bamboo shaft in half lengthwise along that stiff side line. When you open it up, see if there is a noticeable difference in wall thickness from the stiff side to the weak side (possibly using a set of calipers). If there is a difference, I would then use that to determine which side to scrape. It would make sense to me that you would want to even out the wall thickness for consistency.
Does that make sense to anyone?
DC:
--- Quote from: willie on September 05, 2017, 01:41:28 pm ---I cannot remember why, just that it's what I do. Perhaps it does not matter which side gets reduced, but we seem to prefer to do reductions on our bows on the compression side, so maybe just a force of habit?
--- End quote ---
It definitely matters. That's what's bothering me. I've got this arrow just about even now. It shoots a little nock left no matter which way I shoot it. Scraping the compression side of the strong bend is bringing it around. I've had to shorten it twice and I'm about to run out of draw length but I'm learning stuff.
DC:
--- Quote from: Aaron H on September 05, 2017, 02:27:36 pm ---I would think that with bamboo, the difference in stiffness lies in the uneven wall thickness.
Maybe try an experiment on a particular shaft where there is drastic difference in stiffness from one side to the other, mark the stiff side, then cut the bamboo shaft in half lengthwise along that stiff side line. When you open it up, see if there is a noticeable difference in wall thickness from the stiff side to the weak side (possibly using a set of calipers). If there is a difference, I would then use that to determine which side to scrape. It would make sense to me that you would want to even out the wall thickness for consistency.
Does that make sense to anyone?
--- End quote ---
Once I split it in half it's a bit late to scrape :D I see your point though.
Pat B:
DC, Art(artcher1) went all out with arrows. He understands arrows and arrow making like nobody else I know. Unfortunately his health isn't good and he hasn't been around for a few years now. Art scraped the whole cane shaft so they were the same stiffness all around.
Not only cane but hardwood shoot arrows also need for the stiff side against the bow. If possible, Art told me to put the second stiffest side to the shelf(down). That isn't always possible though. Even doweled arrows have a stiffer side which is along one of the grain edge sides. With dowels you also have to consider the grain "flames" so if the arrow breaks when shot it doesn't drive the broken shaft into your bow arm.
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