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Author Topic: spine tester  (Read 4792 times)

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Offline wildman

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spine tester
« on: February 03, 2011, 01:34:01 pm »
I'm sure this has been posted before .Does anyone know of a way to build a fairly accurate spine tester with out costing a small fortune? ???
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Offline Pat B

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Re: spine tester
« Reply #1 on: February 03, 2011, 01:55:25 pm »
Google James Hill Spine Tester!  Cheap, easy to build and accurate enough for me and Art Butner!  ;D  8)
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Make the most of all that comes and the least of all that goes!    Pat Brennan  Brevard, NC

Offline Jake Allen

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Re: spine tester
« Reply #2 on: February 04, 2011, 03:32:13 pm »
James Hill's way is slick as it can be.
I will be making one of those; likely next week!

Good link, thanks!
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Offline artcher1

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Re: spine tester
« Reply #3 on: February 04, 2011, 03:50:59 pm »
I don't use the JH model any more Pat. That one is now outdated by the AB model now>:D................Art
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Offline Pat B

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Re: spine tester
« Reply #4 on: February 04, 2011, 05:04:42 pm »
Art, Is that a derivative of the Jim Hill version or something all together?
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Make the most of all that comes and the least of all that goes!    Pat Brennan  Brevard, NC

Offline jmack

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Re: spine tester
« Reply #5 on: February 04, 2011, 05:35:46 pm »
People make spine calculation much harder than it needs to be. I have a 1x4 mounted on the wall with nails at 26" apart. Centerline is marked on the board with marker, and I then put a piece of masking tape over the centerline mark. Hang my arrow on the nails, draw a line from the top of the shaft on the tape, hang a 2lb weight from the shaft, and then mark the new position on the tape. I only use a 1/32nds ruler to measure the difference. 1/32 is accurate enough for me, and easy to see, but you could use a set of calipers if you need the .0001 or however close you need your tolerances... Anywho, spine is 26/deflection. So if the space between my two marks = 9/16ths, then 26/.5625 (.5625 is 9 divided by 16)=46.2lbs

If that is just too simple for you engineer types, then this is about as easy as it gets with mechanical(ish) action
http://www.youtube.com/watch?v=DhxYuzwDyVM
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Offline artcher1

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Re: spine tester
« Reply #6 on: February 04, 2011, 06:12:48 pm »
Just a little something I cooked up Pat. Ain't purty, but works really well........Art
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Offline stringstretcher

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    • Traditionalarcherycommunitysite.com
Re: spine tester
« Reply #7 on: February 04, 2011, 06:24:17 pm »
And Art's deflection matches mine exactly,,,so it has to be right ::) >:D ::) >:D
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Offline wildman

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Re: spine tester
« Reply #8 on: February 04, 2011, 09:08:43 pm »
Thanks guys I will have a spine tester before the weekend is out.
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" Society your crazy greed , hope your not lonely without me"

-Eddie Vedder-

Lombard

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Re: spine tester
« Reply #9 on: February 05, 2011, 10:47:37 am »
Jmack, just checked out your video, and that is just about as simple as it can get. Simple yet fully functional.

I had built one similar to the one posted in the how to section of this site, but may trade it in for one of your design.
Here is the link to the buildalong posted here on PA, http://www.primitivearcher.com/smf/index.php/topic,4589.0.html
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Offline Tom Leemans

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Re: spine tester
« Reply #10 on: February 08, 2011, 12:47:08 pm »
Geez jmack! After building the fancy dial indicator type that I made, then seeing that video, I feel cheated out of several hours of my life, LOL!
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Offline sailordad

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Re: spine tester
« Reply #11 on: February 09, 2011, 06:41:26 pm »
i just watched that video
it damn sure done get any easier than that now does it
might just have to make me one of them
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Offline bucksbuoy

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Re: spine tester
« Reply #12 on: February 10, 2011, 11:19:03 am »
jmack- thats some awesome information. thanks for simplifying for us.
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Offline Slow Tack

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Re: spine tester
« Reply #13 on: February 10, 2011, 06:12:18 pm »
Yes, very easy to make and looks like it works very well.  Thanks for the info!
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Offline Rick Wallace

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Re: spine tester
« Reply #14 on: February 11, 2011, 01:14:53 am »
I made me one to!   ;D

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U.S.ARMY '86-'91  East Milton Fl.   Dont take yourself to seriously,,No one else does
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