Accurate spine tester

[Old York]

Who makes one that's accurate above 65 pounds?

Thanks

[Jason R. Wesbrock]

I have an Ace Spine Master as well as their new Spine-Spin tester. Both are very accurate, but I have to admit I like the Spine-Spin a little better. It can be easily switched to spine both the old way and with the new ATA method (26" centers & 2# weight, or 28" centers and 1.94# weight), and the scale shows both pounds of spine and inches of deflection, which is useful for carbon shafts. The rollers are super smooth, so it makes a great spin tester for broadheads too.

It's without a doubt the best built, most versitile spine tester I've seen.

  http://www.bowsite2.com/aceshopping/product1.asp?SID=2&Product_ID=228  

 

[DesertDude]

The Spine-O-Meter made by TradGang's own Cupcake.  He is a sponser here.

[DesertDude]

The Spine-O-Meter made by TradGang's own Cupcake.  He is a sponser here.

[Paul Mattson]

Tim,
  You can not go wrong with the Spine-O-Meter.  If you want to take a look at mine, I can stop by sometime.

[rraming]

I use an Ace as well - the one you can hang on the wall and think it is a great piece of equipment.

[Bjorn]

Spine O meter by cupcake gets my vote too!! He will even make it out of your wood.

[Van/TX]

If one is accurate below 65 then it should be accurate above 65.  Is there a hidden question here?        ...Van

[Killdeer]

I checked mine, using aluminum arrows, against another member's tester, and they didn't agree. Once I got up into the upper ranges (out of MY shooting weights, thank goodness!) mine got further and further away from the results on the other meter. I am interested in seeing if others have noticed this in their instruments.

I may need to buy a new tester, or just shrug my shoulders and be glad that in the spines I shoot, it is accurate. And try not to build up my upper body strength.    

Killdeer

[Van/TX]

Killdeer, just curious.  What kind do you have?    ...Van

[Killdeer]

It's a Flight Rite.

Killdeer

[Jack Denbow]

Killy, who is to say the other spine test was right, it may have been wrong and yours right.
Jack

[Killdeer]

Oh no, in such matters I am used to being in the wrong. It's a way of life.    :D  

I guess I should get out some charts and totem-pole aluminums and scientifically check results. I trust the owner of the other tester without question, though, and doubt quite strongly that his would be in error.

Killdeer

[Shaun]

The problem with testing in high spine ranges is that the amount of deflection is so small. There is a lot more deflection difference between 40# and 50# spine than there is between 90# and 100# spine.

[Van/TX]

Flight Rite shout be accurate.  It would be interesting to see your results spine testing some stiff aluminums.  2216's or such    ...Van

[Kelly]

Flite Rite is an exact copy of the Scheib, who's scale is not accurate above 65# and neither is the Adams. The AMO formula is 26 divided by deflection equals pounds or 26 divided by pounds equals deflection. Of those Spine testers I mentioned every one changes their  deflection/pounds scale at 65# or thereabouts. Below 65# they use the AMO scale.

Above 65# I don't know what scale they use but it is not AMO's. Just a simple look at 100# spine should reveal .260 deflection but they do not.

When I was in the business I used Scheib's. Found out about their scale being wrong from the original owners of Rose City nearly 30 years ago. The deflection side of the scale is correct. The corresponding pounds side is wrong above 65#. A simple fix can be obtained by placing a piece of masking tape over the pounds scale, then use a calculator with the above formula to find the correct poundage with the deflection side and remark the pounds on the tape. Use 26 divided by deflection + pounds. 26 divided .260 equals 100# spine and so on. 26 divided by .520 equals 50# spine.

Had all the appropiate spines of aluminums listed on my website but you all know where that has gone. Killdear, if you do the above to your Scheib it will be accurate above 65#.

2016 should be 62# spine
2114 should be 63# spine
2018 should be 68# spine
2115 should be 70# spine
2020 should be 78# spine
2117 should be 82/83# spine
2216 should be 85# spine
2219 should be 95# spine

Disclaimer: Am doing this from memory which these days could be off a pound or two.  

[Old York]

Kelly, there is a conversion factor of
0.825. Multiplying an Easton deflection
by 0.825 gives one the equivalent deflection
in the old AMO rating.

Example: A 2020 has 0.426" deflection (Easton) @28" and 1.94#.

0.426" × 0.825 = 0.351"

An accurate spine tester 26" @ 2# should
show this 0.351" deflection or darn close.

26" ÷ 0.351" = 74# (73.9#)

[SpikeMaster]

Kelly,
       I saved the spine chart web page from you old site. This is what you had listed. Your memory is pretty darn good.

Shaft Size----XX75 Spine
    1616------------32#
    1716------------38#
    1718------------42#
    1816------------44#
    1818------------50#
    1916------------53#
    1918------------60#
    1920------------65#
    2016------------61#
    2018------------67#
    2020------------77#
    2114------------64#  
    2115------------70#  
    2117------------81#
    2216------------84#
    2219------------95#

[Kelly]

Thanks Spike!  All those spines were taken from the Scheib I had recalibrated and 26" centers with a 2.0000# weight. Wish I still had my Scheib.

[Buemaker]

TTT
Found this old post, long time since we heard from some of them.