Main Discussion Area > Arrows
Shaft spiner?
mnewcomb59:
What I was trying to say above was no matter how far apart the posts are, if you set a shaft that is the same as the distance of your posts on there and it pulls down .565 then your spine will be 50#. That shaft will not show the same deflection if you move the posts in, but a completely different shaft of a smaller diameter might show the same deflection and still be the same spine.
In other words a 28" 11/32 POC shaft can theoretically have the same spine as a broomstick, given that the broomstick was long enough to be that flexible. But, cut it shorter and the spine raises. Same as piking a bow. Sorry for the confusion everyone. ::)
UKarcher:
Guys, all this confusion comes from the AMO standards. Bows are usually measured by weight at 28" drawlength, but arrows are spined between 26" centres. As long as you use the same measurement every time for your own personal arrows then you could have it any length you want. The idea of hanging a wrench off the end of the shaft is just as accurate as long as the wrench is place the same distance from the fixed end everytime.
Graham
D. Tiller:
Interresting designs and ideas guys! How about just hanging the arrow between two uprights and then suspending a 2# fishing weight from the center and eyeballing it against a white peice of paper behind it. If you have one shaft of a given weight then you can compare the two and you should have a good enogh idea of what the spine is.
D. Tiller
Primitive1:
Unless I missed the explanation for tapered/barrelled shafts? I barrell taper mine...how will that change my setup? I made a maple spinner which I use for shaft straightening that I want to make into a 'spine tester'. I shoot 31" barrelled tapered arrows with a 26" draw length (and yes, I luv'em that way)...so how do I proceed? The other item of consideration is how much your bow/string is aligned to 'true' bow center...I usually make my bows lined up to the left (I'm a right handed shot) so spine hasn't been too much of a problem. I would still like to know and measure...and want to do it right the first time. Any suggestions? Thanks...
Justin Snyder:
--- Quote from: UKarcher on August 21, 2006, 09:41:02 am ---Guys, all this confusion comes from the AMO standards. Bows are usually measured by weight at 28" drawlength, but arrows are spined between 26" centres. As long as you use the same measurement every time for your own personal arrows then you could have it any length you want. The idea of hanging a wrench off the end of the shaft is just as accurate as long as the wrench is place the same distance from the fixed end everytime.
Graham
--- End quote ---
After you posted this I looked up AMO standards. CONFUSING ??? They can even pervert the draw length and bow length issues. So basically what I understand is that they measure between 26" centers but it is calculated for a 28" arrow.
Primitive: just fallow the instructions on the site Pat posted. Set it up at 26". I shoot arrows several inches longer than my draw length because I don't want the broadhead getting to close to the back of the bow and interfearing. Justin
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