Can anyone recommend a simple way to determine spine on raw shafts? Ive heard of people doing it with two nails in the wall and just measuring the deflection but what amount of deflection equals what spine? Thanks gang.
If you have a aluminum shaft, start with that one with a known spine. Hang your weight on it and mark the deflection on wall. Compare to your raw shafts.
Here is a chart if you scroll down far enough.
http://www.jamesmhill.com/Spine_Tester.html
thats exactly what I was looking for reddogge and a good idea too Hot Hap. thank you.
the only concern with checking shaft spine is shaft concentricity. if the shaft isn't true, you won't be able to get an accurate spine check.
with my home made spine meter, i read known good shafts that fly well outta my bow(s), note the meter deflection, duplicate with other shafts. spine deflection will probably be different for different shaft materials! iow, carbon shafting has very different dynamic and static spines!
here is a spine chart with common aluminum sizes spined like you would spine a woodie...
Shaft
Size Spine Old GG or 24SRT Spine
1616 32#
1716 38#
1718 42#
1816 44#
1818 50#
1916 53# 55#
1918 60#
1920 65#
2016 61# 63#
2018 67# 70#
2020 77# 80#
2114 64#
2115 70#
2117 81# 83/84#
2216 84# 86#
2219 95# 98#
This is what I came up with not too long ago bucks. It has spined a ton of arrows for me, and i didn't have to spend $200+.
http://tradgang.com/noncgi/ultimatebb.php?ubb=get_topic;f=125;t=004573#000000
Hope this helps.