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Author Topic: Arrow spine  (Read 221 times)

Offline mzombek

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Arrow spine
« on: February 23, 2013, 07:47:00 AM »
Hey guys,
I'm not sure if this is the correct place for this question. Anyway, do any of you know of a web site that shows how to build a tester and also explain how it works?
Thanks,
Z
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Offline Sharpster

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Re: Arrow spine
« Reply #1 on: February 23, 2013, 12:15:00 PM »
Michael,

I'm doing the same thing right now. I'm not sure if I can post links but if you type these words into your browser: measuring arrow spine deflection, then in advanced search, under "None of these words" type in the word: Charts

You'll see a bunch of ways to make your own.


Ron
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“We choose to do these things, not because they are easy, but because they are hard” — JFK

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Offline Sharpster

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Re: Arrow spine
« Reply #2 on: February 23, 2013, 12:35:00 PM »
Sorry man I posted too soon.. Just search "Homemade arrow spine tester"... I found several different tutorials for making various designs. Try using the search feature here on TG too.

Ron
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“We choose to do these things, not because they are easy, but because they are hard” — JFK

 www.kmesharp.com

TGMM Family of the Bow

Offline mzombek

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Re: Arrow spine
« Reply #3 on: February 24, 2013, 01:48:00 PM »
Ron,
I am still trying to understand  this spine stuff. From what I understand, the devise uses a 2 pound wt. to deflect the arrow. The distance of deflection with a two pound wt. is what your spine is. I understand the deflection in inches, but I don't understand what the numbers are that it is converted to represent.
Thanks,
Mike
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Offline WESTBROOK

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Re: Arrow spine
« Reply #4 on: February 24, 2013, 07:56:00 PM »
Mike, the shaft will be suspended between points 26" apart. When the 2lb weight is hung on the shafts the needle will point to a number on the scale (deflection in .001 of an inch). Lets say a shaft measures .335" deflection, you divide the 26" spread by .335 and it will give you 77.6, that shaft has a AMO spine of 77.6lbs. That is how wood shafts are measured, Aluminum and Carbon are measured between 28" points with a 1.94lb weight.(that is the ASTM measurement)

Eric
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Offline Triphammer

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Re: Arrow spine
« Reply #5 on: February 24, 2013, 08:02:00 PM »
Search here for a spine gauge or spine tester. there's several. seach the net & find dozens. Stone simple in theory! I built mine with info here & some ideas from some other sites then use my own idea for suporting the 2# weight.
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Offline mzombek

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Re: Arrow spine
« Reply #6 on: February 24, 2013, 08:06:00 PM »
Ron, Eric,
I appriciate your explanation on a subject that only a newbie could ask.
All of you guys that answer these questions are so valuable to us less educated to this sport.
Thanks so much for you help.
Mike
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Offline WESTBROOK

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Re: Arrow spine
« Reply #7 on: February 24, 2013, 08:33:00 PM »
Sure Mike, good luck with your project. If your building wood arrows, a spine tester is essential IMO, carbon and Alum are pretty consitent.

Eric
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