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Compressing Shafts.

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CraigMBeckett:
El Destructo


--- Quote --- I know that when you compress a Copper Wire for a Flaking Tool....It makes the Wire Stiffer...
--- End quote ---

Absolutely correct but you are nor so much compressing the copper, that is changing its sectional area, as you are work hardening it. It is this work hardening that gives you a stiffer piece of metal. You are increasing the modulus of elasticity E in the equation when you work harden the wire.

Craig.

Greatgoogamooga:
Here's a though experiment.  Take a pice of 30" copper pipe, 1/2" diameter, like those used in plumbing and bend it in your hands.  Now keep the same length, but increase the diamter to 6".  The larger diameter would be thinner, but would be harder to deflect.  It would also be more prone to breakage.

I learned this lesson back in the 80's when I worked at a bicycle shop.  That's back when the manufacturers started experimenting with over-sized tubing.  Today, all bikes use the larger diameter for greater stiffness at the same, or less weight.

Goog

half eye:
Hey triple G,
       I'm kinda like Pappy, but I shoot hardwood arrow shafts and usually like the big ole fat kind....but I can make small diameter stiff spined as well.....just change the wood.  I really like black ash for my personal arrows (these weigh about the same as spruce but they are a lot tougher)....if I want to go small, but still want spine and weight I use maple or white oak.
       Know that isn't really what you asked but like pappy, I should've paid more attention in school too. Changing wood was my solution, and I seem to do everything the hard way :D
half eye

ken75:
i guess common sense isnt all that common, i was wrong

JW_Halverson:

--- Quote from: Greatgoogamooga on February 26, 2010, 11:57:32 am ---
I learned this lesson back in the 80's when I worked at a bicycle shop.  That's back when the manufacturers started experimenting with over-sized tubing. 
Goog

--- End quote ---

I remember those beer can bikes!

 I was just looking at that shaft compressor in their catalog yesterday.  I bought two dozen 23/64th tapered cedar shafts last summer for $5 and I cannot get them to shoot straight.  I left them full length (32"), put 160 grain field points on them and they still come off the bow hardnock right.  The bow is pulling 50# at my normal 26" draw, but I can adjust my stance and pull 27 just as easy for a little more draw weight.   I just kinda hoped with 4 inches over the standard 28, heavy points, tapered shafts, and overdrawing slightly I could make use of them.    I suppose I will have to buy the tool and post my "product review".

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