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Author Topic: My Improved Spine Tester  (Read 918 times)

Offline Cupcake

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My Improved Spine Tester
« on: June 03, 2007, 10:20:00 PM »
I designed an AMO spine tester so I can start making wood arrows and this is the second iteration to improve things a bit.  This tester is 2.0 pounds at 26 inches per AMO standard.

 

I have improved the scale to also read deflection as well as AMO spine.  This deflection is not the same as Easton, et. al., report because they measure spine using 1.94 pounds at 28 inches.

 

The second improvement is adding a ball bearing assembly to the pivot point for the pointer.  The first version used a bushing arrangement that was OK but had a bit of stiction.  I think the weight applied from above, directly atop the pivot arm is a bit better than hanging a weight from the shaft.

 

Tell me what you think.
Kevin
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Offline Shadow Hunter

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Re: My Improved Spine Tester
« Reply #1 on: June 03, 2007, 10:33:00 PM »
Looks Great
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Online kennym

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Re: My Improved Spine Tester
« Reply #2 on: June 03, 2007, 10:39:00 PM »
Looks good! Curious,how do ya zero your pointer for different diameter or, uhh, err, crooked arras?
I really like the weight on top too!
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Offline Cupcake

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Re: My Improved Spine Tester
« Reply #3 on: June 03, 2007, 11:15:00 PM »
On the left arrow support is a thumbscrew adjustment that zeros for different shafts.
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Offline Danny Rowan

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Re: My Improved Spine Tester
« Reply #4 on: June 03, 2007, 11:31:00 PM »
Ok, now start making them for sale, I will be first in line. I like it better than my store bought modle.

Danny
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Offline Bowspirit

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Re: My Improved Spine Tester
« Reply #5 on: June 04, 2007, 12:26:00 AM »
Good lord! That's the finest looking homemade spine tester I've ever seen. Great work!!!  :thumbsup:    :notworthy:
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Offline DesertDude

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Re: My Improved Spine Tester
« Reply #6 on: June 04, 2007, 01:45:00 AM »
Well Kevin,  you have come along way "Grasshopper" Very fine.....  Sorry I missed you all this weekend.  the deflection is a great addition. I want one .......we'll talk at breakfast..........Mark
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Offline Cutty47

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Re: My Improved Spine Tester
« Reply #7 on: June 04, 2007, 02:07:00 AM »
I love it.  I'll be second in line.  Just wondering, why don't wood arrow manufacturers, shaft sellers just go to the Easton deflection standard?  Since most of us these days are coming from carbons and aluminum back to woodies?
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Offline Falk

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Re: My Improved Spine Tester
« Reply #8 on: June 04, 2007, 05:14:00 AM »
Wow!
Kevin, that's some nice work! And I love your attention to detail! This spine tester should fit into every living room without disturbing the view of the "better half" in your life. Clever planed and done!  ;)   :D
________________________________________________

 
Quote
posted by Cutty47:
why don't wood arrow manufacturers, shaft sellers just go to the Easton deflection standard?  Since most of us these days are coming from carbons and aluminum back to woodies?
"Easton Standard"  :confused:  ???????   "[dntthnk]"  

Not ALL are comming "back" from something!
IMO those who had/do turn back - should not ask the "ridgid ones" to adjust to their new point of view, but get themselfs back to the good old sights.
Ahh, I don't know if I got this accross now - somehow difficult for me to explain ...
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Offline Cutty47

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Re: My Improved Spine Tester
« Reply #9 on: June 04, 2007, 05:54:00 AM »
Falk, I'm not sure about you, but if you take your accuracy seriously, you bareshaft...

Ever try bareshafting woodies?  Don't work so well...

Sooo, any whooo...

Matching aluminum deflection to the same deflection in wood saves you a whole bunch of money in the long run.

I love bows.  Bows cost money.  Hunting trips cost money.  Poorly spined arrows are firewood.

People get discouraged buying expensive firewood.

People stop buying woodies.  Woodie dealers go out of business.

The "rigid" ones can find woodies anymore.

Have to go to Easton deflection anyway...

I've never even seen a simple chart comparing common aluminum arrows with wood arrow poundage.

Besides, demystifying and standardizing the wooden arrow spine is going to do nothing but bring more people back to shooting wood.

Think about it...with the advent of glass laminations, R/D bows, and especially FF strings, some sort of change should have been made...

All of this add five pounds for a "modern recurve," add another five pounds for "FF string"...add five more pounds for hardwood shafts over cedar because they don't recover as quickly, add another five pounds if your bow is cut close to center...

...so, I need an #80 spine out of a #67 LB?  Or is it a #75 spine?  And what about poplar versus chundoo?  What about hickory versus Ash?  And are hexpine shafts hardwood?  And how does laminated birch behave compared to hexpine?

Can you tell I've been trying to make the transition?  Lol...
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Offline W.Tim

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Re: My Improved Spine Tester
« Reply #10 on: June 04, 2007, 06:48:00 AM »
nice looking set-up  :thumbsup:
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Offline Minuteman

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Re: My Improved Spine Tester
« Reply #11 on: June 04, 2007, 07:49:00 AM »
You want a little cheese with yer wine!
 I have no trouble bare shafting wooden arrows.
 Nice spine tester Cupcake. Makes my homemade job look like it was made in the landfill.
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Offline paleFace

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Re: My Improved Spine Tester
« Reply #12 on: June 04, 2007, 08:24:00 AM »
nice work Kevin, i'm in line for one as well.
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Offline Ray Hammond

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Re: My Improved Spine Tester
« Reply #13 on: June 04, 2007, 09:29:00 AM »
wha did you use to print that metered chart on a curved plane like that??

Some software I've not seen before?

I know I'm setting myself up as a complete computer fool..but it doesn't bother me because I am...so tell me, please..how you printed that way?

High quality craftsmanship. Do you have an idea what you spent in materials to build it?
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Offline Jeremy

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Re: My Improved Spine Tester
« Reply #14 on: June 04, 2007, 09:43:00 AM »
Cutty, here's a simple spine chart for ya:  http://www.arrowsbykelly.com/Spine_Charts.html

That's a slick tester!
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Offline Cutty47

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Re: My Improved Spine Tester
« Reply #15 on: June 04, 2007, 10:32:00 AM »
Thanks Jeremy, I refer to that chart quite a bit.

Apologies for the rant...just finished a dozen POC and after shooting them I think they're underspined.
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Offline gwhunter

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Re: My Improved Spine Tester
« Reply #16 on: June 04, 2007, 01:35:00 PM »
Cutty, Now you have a new project.  Build you a bow to match your arrows.  Then you get another bow and you get to keep your arrows out of the fire.  

I would be willing to bet you could sell them if bowbuilding is not an option.  But you know that already.
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Offline vermontrad

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Re: My Improved Spine Tester
« Reply #17 on: June 04, 2007, 02:00:00 PM »
Nice work! If you make them they will sell...
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Offline Big Si

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Re: My Improved Spine Tester
« Reply #18 on: June 04, 2007, 03:43:00 PM »
"I want one" looks briliant would you consider making any to sell and how much
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Offline 58WINTERS

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Re: My Improved Spine Tester
« Reply #19 on: June 04, 2007, 05:24:00 PM »
I'll take one.
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