Improved, Spine-O-Meter Mark II

[Old York]

The Oak Creek link works for me. Whether you can still order from them is questionable, but I can click on all the buttons on the web site and see the deflection charts, explanation of formulas...etc.

  Burnsie, thank you for that information! I gave my computer a mighty crack and all is good now. The link works.

Kelly, yes, I'm well aware of Easton's 'snafu' regarding the 1.84 pounds (more correctly, it's 1.94 pounds). Bob Burton has explained it to death. Er, I'm not sure what all that has to do with my message I posted before...

Yes, deflection is deflection, be it wood or other. Easton's method and the ATA (old AMO) method are translatable using the .825 factor, and it is explained in the following link. Please give it a careful reading.

https://oakcreekarchery.com/arrow_translation.pdf

[LoneRanger]

This is an excellent reference from Oak Creek. Thank you for sharing this.

[Kelly]

What it all means York is his scale is wrong. 50# woods should be .520 deflection and his scale is not even close to that!

I've been using a Scheib spine testor for almost 60 years so I know some about this subject. Yes 1.94# is the weight of Easton used on their Scheib spine testor.

[Cupcake]

Greetings everyone.  I have not been making the original Spine-O-Meter for some time now so I am sorry to dissappoint anyone interested in obtaining one.  I have a more recent design that is electronic and uses an angle sensor in place of the traditional needle, it also includes a weigh scale.  I am not actively marketing them but do have the circuit boards to make a few more.

Kelly, if you would be so kind as to read the paper on my website it will explain the conversion between ATA (AMO) and the ASTM method used for carbon and aluminum.  I stand behind my work, so if anyone can actually prove that I have erred in my design I will be glad to learn from them.  I worked hard to become a competent engineer and my work has always been done with careful study and rigorous double and triple checking.

I am still an avid archer but have moved on to design and build other things that are more in the realm of art.

The Oak Creek Archery website will not be around much longer so if you want to download any of my papers do it soon.

[Kelly]

Am not talking about the conversion, just saying your wood scale is wrong. 50# spine is .520, do you not agree?

[Cupcake]

My scale is not wrong.  The deflection on the Spine-O-Meter scale is from the ASTM method of 28" span and 1.94lb. weight.  That info is clearly marked at the top of the scale.  The ATA method is shown on the 'pounds spine' portion of the scale.

I chose to do it that way so that one could see the ATA method (wood shaft) in pounds spine aligned with the ASTM (Al & C shafts) for easy comparison between the two methods.  I also included where Easton aluminum shafts fall so that one could have that information as well.

All of this is described in the Spine-O-Meter instructions and the paper I wrote comparing the two methods.