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Topic: Spine question (Read 380 times)
csdqm2
Trad Bowhunter
Posts: 44
Spine question
«
on:
February 18, 2009, 09:57:00 PM »
Can someone explain to me spine deflection. Is there a inch/pound equation. If I buy a spine scale does it measure in inches or pounds? can i build one and save myself a hundred bucks or so.
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"Allways do sober what you say you'll do drunk... It will teach you to keep your mouth shut."
TroyH
Trad Bowhunter
Posts: 283
Re: Spine question
«
Reply #1 on:
February 18, 2009, 10:06:00 PM »
First, let me say that I don't pretend to be the one who should try to explain this to you. A spine scale measures the bend of an arrow at a set length under a set pressure. The standard scale is using a 26" arrow with 2 lbs of weight applied to the middle (either by hanging a 2 lb weight or having the same push down on it. The deflection is measured in inches, ie 500 deflection is half an inch.
And the answer to the second question is, yes you can. I built my own for $20 or less. I used this model with my own modifications.
http://www.jamesmhill.com/Spine_Tester.html
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Formerly known as PastorHunter.
csdqm2
Trad Bowhunter
Posts: 44
Re: Spine question
«
Reply #2 on:
February 18, 2009, 10:13:00 PM »
Thank you. That helps alot. There is a lot of info there. Now I have to go out and find a dial indicator
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"Allways do sober what you say you'll do drunk... It will teach you to keep your mouth shut."
ranger 3
Trad Bowhunter
Posts: 2147
Re: Spine question
«
Reply #3 on:
February 18, 2009, 10:17:00 PM »
You can get a dial indicator at harbor freight
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Black widow PLX 48@28
Black widow PSRX 48@28
Pat B
TG HALL OF FAME
Trad Bowhunter
Posts: 15009
Re: Spine question
«
Reply #4 on:
February 18, 2009, 10:47:00 PM »
Actually the uprights of a spine tester are 26" apart and the arrow used is 28". You hang a 2# weight from the center of the shaft and measure the deflection. With wood arrows, for each inch over 28" subtract 5# of spine weight and for each inch under 28" add 5# of spine weight.
Google James M Hill spine tester. He has everything you need from building the tester to the deflection table in thousandths of an inch as related to the spine weight in pounds (.464=56#)
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Make the most of all that comes and the least of all that goes!
TGMM Family of the Bow
Cupcake
Trad Bowhunter
Posts: 291
Re: Spine question
«
Reply #5 on:
February 18, 2009, 11:04:00 PM »
You forgot to mention that the spine, in pounds, is derived by dividing 26 by the deflection.
I wrote a paper that explains the wood and carbon/aluminum systems of measurement and goes through the math. If you want it give me an email address.
Kevin
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R. Combs
Contributing Member
Trad Bowhunter
Posts: 343
Re: Spine question
«
Reply #6 on:
February 19, 2009, 07:42:00 AM »
Kevin,
could you email one to me also.
Thanks, Rick
[email protected]
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manny718
Contributing Member
Trad Bowhunter
Posts: 132
Beauty is the making one of opposites.
Re: Spine question
«
Reply #7 on:
February 19, 2009, 08:10:00 AM »
hi,kevin i would love one to.maybe you could post it.
[email protected]
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Beauty is the making one of opposites.
csdqm2
Trad Bowhunter
Posts: 44
Re: Spine question
«
Reply #8 on:
February 19, 2009, 08:14:00 PM »
Thanks Cupcake,
My email address is
[email protected]
Thanks again to all.
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