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