Archery Talk Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
5,044 Posts
Discussion Starter · #1 ·
I bought some new arrows (about 8 months ago) and it appeared that I had some flyers and I needed to know if it was me or the arrows. I finally got around to building this tester, which has been on the to do list for quite some time. Usually those flyers are me but in this rare instance it was in fact the arrows. Several of them were way out of factory specifications so my time invested in building was totally worth it.

So here is my Spine tester/shaft spinner. This spine tested can test a 28" shaft and it has a weight to spec of 880 gram weight or 1.94 pounds. The steel weight sits in a tube and presses down from the top of the arrow. Not shown in the pictures is a slider that holds the weight up when changing arrows. the only really different design part of it is the rubber wheel I added to help me control weight on the shaft as I spin it. It seemed no matter how careful I was when using my finger spinning the shaft I always seemed to add a little flex in the shaft while spinning. This flex transferred to the dial indicator giving wildly inconsistent results, it just seemed to bounce all over the place. By adding the wheel and using it to spin the shaft it helped to make it a lot easier to apply targeted pressure and to rotate the shaft with less interference.

As you can see, like most of my work, I left the rust\oil patina and mill lines on the unit to give it that home built character that a true DIY'er would appreciate. OK OK the truth is I'm a lazy old fart that can't be bothered to paint anything once I get it in working order.

*** Note how huge that weight is, 2 pounds is a lot of steel! ***

Enjoy
 

Attachments

·
Registered
Joined
·
5,044 Posts
Discussion Starter · #3 ·
Well ordinarily I would have expected it to be me. What got me thinking that it might be the arrows was that I seemed to be a lot more accurate with other bows I own. These other bows were of the same model but were setup to use different arrows. So after testing I found some really nasty misshapen arrows in this particular bunch. After I removed those bad ones my groups tighten right up.

So in this odd case it was in fact the arrows
Go figure.
 

·
Registered
Joined
·
2,565 Posts
Bow bender, still using my spinner. What arrows were giving you trouble?

Tuna
 

·
Registered
Joined
·
5,044 Posts
Discussion Starter · #5 ·
Hey Tuna happy to see ya, Haven't heard from you in a while, great to hear the spinner is still spinning.

Honestly I'm not sure I want to throw the arrow manufacturer under the bus since I bought the arrows on Ebay I'm wondering if somebody didn't weed a bunch of bad ones out of their stack and then sell them as a matched dozen on ebay. For what it's worth the arrows are Beman Hunters. I checked my Easton Axis and they were very consistent. I then checked my CX Nano XR's as you would expect for an arrow that costs 250 a dozen they were nearly perfect.
 

·
Registered
Joined
·
577 Posts
Great job!
 
1 - 9 of 9 Posts
Top