.... ARROW SPINE TESTER...?????

[getstonedprimitivebowhunt]

I have a old spine tester. whats the best way to calibrate it. Should I just put different known ### shafts on and mark curved arm with each ##### ???. Also who maked new ones ???? Thanks for Your help.

[Jim Curlee]

You can use a dial indicator, to check the deflection of your shafts.
Then convert the shaft deflection into pounds.
Jim

[freefeet]

Originally posted by getstonedprimitivebowhunt:
Also who maked new ones ???? Thanks for Your help.

Ace Spin and Spine Tester.  Good quality bit of kit.

[harvestmoon]

Hey Jim, do you know where I can get a conversion chart...

[MercilessMing]

http://www.rosecityarchery.com/AMOspine.html

[Encino Man]

On an AMO scale it's two holding points at 26" divided by the deflection using a 2# weight. Example 26/.500=52# spine

There is also an ASTM scale used for carbons that uses 28" spacing with a 1.94# weight.

[stringstretcher]

Look up Cupcake on here.  He makes the best out there

[Jim Curlee]

Encino Man, is 100% correct.
Jim