DIY Spine Tester/ Indexer

Soskop

FNG
Joined
Mar 28, 2024
Messages
12
I didn't feel the need to buy a $300+ spine tester just to index my shafts, and was set on doing it myself, so, after many hours of research and Google searches, I present a bare bones wall mounted spine tester.

Notes:
The design is heavily influenced by others online. I do not claim to have designed this totally myself.

My dial indicator came with a mounting plate on the back that was not flat. Used a galvanized metal roofing stress plate instead.

Removed the plunger spring from the dial indicator, as it was causing some unnecessary noise. Seems a touch more accurate and easier to read as the dial isn't bouncing around as I spin the shaft.

I was too impatient to make a prettier weight, but I will and will post updates once done.

I used hooks instead of bearings because it was easier with this design. Works well for me, but may tinker with bearings later on.

Overall, I am super happy with it. It was actually fun to make. I wouldn't mind making a few more

Open to any and all feedback!

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ndfb35

Lil-Rokslider
Joined
Jul 9, 2020
Messages
122
Location
Montana
Nice work 👌🏻 A reasonably priced alternative is from Ruff Lights. He 3D prints a kit that has worked well for me and the quality is above average.
 
OP
Soskop

Soskop

FNG
Joined
Mar 28, 2024
Messages
12
Nice work 👌🏻 A reasonably priced alternative is from Ruff Lights. He 3D prints a kit that has worked well for me and the quality is above average.
I'm not sure he's doing it anymore. At least, I cant find it anymore.

If I made more of these and sold them, they would probably sell around $100 based on material and how long it takes me.
 
OP
Soskop

Soskop

FNG
Joined
Mar 28, 2024
Messages
12
can you test some arrows of known spine to see how accurate it is ?
I will! I initially needed it just to index my arrows, so the weight is a little over 2lbs as it didn't need to be super accurate for just indexing. As soon as I get an actual weight built at the correct 1.94lbs I will test it and report back
 
OP
Soskop

Soskop

FNG
Joined
Mar 28, 2024
Messages
12
can you test some arrows of known spine to see how accurate it is ?
Redid my weight (still not pretty, but it works)

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Measured a dozen Victory RIP TKO 300 spine bare, uncut shafts and got the following measurements:

x4 .300
x2 .301
x3 .302
x1 .303
x1 .304
x1 .312

Not sure what's up with the one at .312, but I triple checked it, maybe it's just an outlier, but it would appear to be pretty accurate!
 
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