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Spine Tester

Introducing the Spine-O-Meter Deluxe

Now taking orders for the first limited production run. Introductory price: $340USD

Introducing the latest advance in spine testers.  This new design is an all-metal, precision machined instrument, ensuring accuracy, repeatability and a long service life.  The biggest advance is the use of a pneumatic cylinder to raise and lower the weight.  The cylinder is operated with a foot switch – freeing the operator to handle and spine shafts more efficiently.  The scale has been repositioned to place the zero mark at eye level and the spine readings straight in front of the operator.  These ergonomic refinements make this the best spine tester available for high volume use.  The short video below showcases the features of the Spine-O-Meter Deluxe.

Spine-O-Meter Deluxe Video

The new Spine-O-Meter Deluxe retains the  same versatile scale that that provides AMO (ATA) spine, aluminum and carbon deflection and the equivalent aluminum arrow size.

Archers are often confused when discussing traditional wood spine and aluminum or carbon spine because they are measured with two different methods.  The Spine-O-Meter Deluxe is designed to translate between the two different spine “languages”.  Now, if someone wants to know “what Brand X carbon shaft is equivalent to a 60-65 wooden arrow” the answer is readily available.

The Spine-O-Meter Deluxe measures arrow shafts using the Archery Trade Association (ATA, formally AMO) standard, 2 pounds and 26 inch span.  The scales are marked with ATA pounds spine, the deflection that carbon and aluminum manufacturers use, 300, 400, etc. and the aluminum shaft size relative to wood spine.  This allows for fast and easy comparison of all types of shafts.

The traditional ATA spine test method uses a two pound weight on the shaft supported at 26 inch span.  The “modern” method, ASTM F2031-05 “Standard Test Method for Measurement of Arrow Shaft Static Spine (Stiffness)”, uses 1.94 pounds with the shaft supported at 28 inches.  Using bending theory of beams and a little algebra a translation between the two methods has been incorporated in the design.  The Spine-O-Meter Deluxe is the Rosetta Stone for arrow shafts.

A paper detailing the math behind arrow spine conversion between the two methods can be downloaded here.  Arrow Spine Translation

A table relating shaft deflection, in both measurement systems, to pounds spine can be downloaded here. Deflection to Spine

A table showing spine of aluminum and carbon shafts can be downloaded here. Aluminum and Carbon Spine

On a Budget? The Spine-O-Meter Deluxe is available in a manual version.

The Spine-O-Meter Deluxe Manual offers the same accuracy and repeatability at a lower cost by deleting the pneumatic components. If you don’t have the need to spine arrow shafts in high volume this version is just the thing. In the future the pneumatic components can be added for high volume.

Spine-O-Meter Deluxe Manual just $240


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Spine-O-Meter Mark II – Out of Production

The spine tester that translates between traditional wooden arrow spine and modern carbon and aluminum deflection measurements.

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