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Help-Tiny very simple spine tester
majsnuff:
I cheated with my home made spine tester.
On an old 30" cabinet door, I drove one nail for the arrow knok end at one edge of the door, a pivot point 10" from that. Made a 2# weight with an old leather pouch and some bird shot. (could use sand too)
Went to a local archery shop and picked up POC arrow shafts spined at 5# increments.
Back home, I simply lodged the knok end under the nail, rested the shaft over the pivot, hung the weight at a pre-marked 28" on the shaft and traced the curve of the shaft along the bottom edge.
Repeat that with all the shafts I had bought and I was done. No moving parts, no formulae, no sweat.
Total cost was for the POC shafts at a couple bucks each. I keep them for control shafts.
I spine all my arrows on this now, every thing from cane/bamboo to POC, maple etc. even my shoot shafts of Ocean Spray and Syringa get to visit this simple little cabinet door spine tester.
El Destructo:
Pat the Link dont work......... ???
PeteC:
Wolfsire,measuring spine is a simple procedure ,that can be accurately done with the simplest of equipment.
Just as the others said; drive 2 nails,26" apart,horizontally into a shop wall,or the edge of a shelf. Set the arrow across the nails. Halfway down the shaft,mark either the top or bottom edge of the arrow.Now ,hang a 2 # weight in the center of the shaft,then mark the new position of the deflected arrow shaft. Now,measure this distance in inches. Say it deflects 3/8". 26 divided by .375= 70.27# of spine .Nothing to it. God Bless
Pat B:
Mike, put an "underscore" between "spine" and "tester" ( spine_tester )
Justin Snyder:
Try this one Mike. http://www.jamesmhill.com/Spine_Tester.html
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