10 feb. 2012

How to make a DIY arrow spine tester


In one of my previous posts I showed you how to make an arrow fletching jig, today I made a design for an arrow spine tester in Google Sketchup. This spining jig is a basic setup to measure the flexibility of your arrow shafts. . The arrow rests on two sides, at exactly 26 inches from each other. In the center a two LBS weight is placed and the deflection of the bending arrow is measured on a chart. You can find a detailed description and parts list here. A few pictures of the Sketchup model:

You see a needle that points the amount of deflection on the dial face at the back of the jig and also a AMO chart that shows the corresponding spine measured in LBS.
 Both elements are available below (original design by 2Jays):

To show you the total design I made a movie of this jig:

Any questions? Just let me know.

Kind regards, Mark Storm

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