I want to build myself a spine tester to calculate the spine value of arrow shafts using the ASTM F2031 standard. I do know that I need a 880 gram weight and that I have to measure the amount of flex that the shaft produces when I hang said weight at the center of a 28 inch span off the shaft.
Well, but what then? I can measure the amount of deflection I have then but let's say the shaft is deflected by 1/12th of an inch or some millimetres. How do I calculate a spine value that ranges between 20 to 80 from that?
Can anybody give me a hint or solution?
3 Comments
BigDanishGuy@sh.itjust.works · 2 pts · 1y
According to https://www.infocusarchery.com/advice/a-completeish-guide-to-arrow-spine spine is the deflection in 1"/1000. As in spine 730 means the deflection is 0.73"
fmstrat@lemmy.nowsci.com · 2 pts · 1y
Did you ever figure this out? Wondering if I could 3D print a jig.
weissbinder@feddit.org · 2 pts · 1y
I kinda gave up, unfortunately. There are several jigs on thingiverse and I plan on trying them out.