August 20th, 2011, 08:43 PM
My DIY Arrow Spine Tester
1 dial gauge = $12
1 pack of roller blade ABEC 7 roller bearings from Dick's Sporting Goods = $30
1 four foot long 1x4 pine board cut to 28" = $3
Miscellaneous steel brackets, bolts, kotter pin, nuts, washers , etc. = $55
5 hours of my time and labor putting this thing together = Free
Years and years of arrows tuned to perfection = Priceless
August 20th, 2011, 08:59 PM
August 21st, 2011, 12:37 AM
What is the benefit of "finding your stiff side"?
If there is a way to shoot myself in the foot, I would most likely miss anyway.
Illinois Bowhunters Society member
August 21st, 2011, 10:59 AM
So you can orient all your arrows the same way. If you fletch the cock vane on the stiff side, on all the arrows, they'll all flex the same way coming off the bow, giving you more consistent shots and better grouping.
Originally Posted by daltongang
August 21st, 2011, 12:31 PM
August 23rd, 2011, 02:30 PM
Wow bro. Great work. May be a bit out of my league though. I can definately see the benefits of it.
August 23rd, 2011, 04:42 PM
Thanks. I thought it was out of my league too, until I finally had time to sit down, sketch out what I needed to do and the parts to do it with and voila! - a spine tester.
August 23rd, 2011, 04:45 PM
How much weight did you use
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August 23rd, 2011, 11:26 PM
Originally Posted by kw1
I changed the design tonight. Those eye-bolts holding the vertical bolt with the washers on it had too much free play and it was hard to get a reading when I spun an arrow. I took out the eye-bolts and fabricated a 3" sleeve using 5/8" PVC pipe and a few screws to tighten up the tolerance from the 1/2" dia. bolt to the inner dia. of the pipe. I also lubed the 1/2" bolt so it slides easily. There is hardly any wiggle room now and everything lines up nicely. I'll get a picture of it when I get the chance.
August 24th, 2011, 04:59 AM
Where did you get the Dial Gauge??
Originally Posted by L.I.Archer
August 24th, 2011, 08:27 AM
Harbor Freight Tools.
Originally Posted by turkeyhunter60
August 24th, 2011, 09:32 PM
Here's the updated weight slide. There is no free-play in this version vs. the eye-bolt version:
August 25th, 2011, 12:02 AM
Good Job and Thank You....That 1/2 inch bolt...Did you cut the bolt with a Hack Saw flat to mount the rollers on to it...???..And when you put the weight onto the middle of the arrow, you said 2 pounds, you rotate the arrow by hand to find the stiffest spot,spine, and mark it, then your done...???....
August 25th, 2011, 12:16 AM
The 1/2" bolt is notched 1/2" from the end and halfway through the diameter so I had a flat spot to mount the L-shaped angle that the rollers are mounted to. On the backside of where I notched, I filed down another flat spot so that the screw head had something flat to sit against.
Originally Posted by turkeyhunter60
And between the original post and this one, notice I moved both rollers on the T-angle to the same side.
And yes, you roll the arrow with your finger right above where the arrow sits on the rollers so you don't influence how the arrow bends. I watch the gauge's needle as I spin the arrow and mark the top of the arrow when the number goes highest on the dial. The top of the arrow at this point would be the stiffest.
August 26th, 2011, 04:24 AM
Thank you for the Info...I got it now....
August 26th, 2011, 05:31 AM
heres AMO standard for measuring arrow spine if you want to get weight dead on, 2lbs is quite close but 1.94 is the exact number
Originally Posted by kw1
.....The measurement is made by spanning the shafts between 28″ centers . A 1.94 lb. weight is suspended from the center of the shaft and the deflection measurement is made with a digital linear gauge. This is per the AMO standard.
August 26th, 2011, 11:39 AM
I didn't care about the AMO standard weight. I know what it is; I just rounded it up to 2 lbs, since I am only using it to measure where my arrow spine is stiffest so I can fletch all my arrows with the stiff side up.
Originally Posted by dwagoner
August 26th, 2011, 10:30 PM
Here is another spine tester. There should be charts to convert your dial to spine.
August 26th, 2011, 10:51 PM
No need to convert anything. I just look at the dial while I'm turning the arrow and look to see where the dial number increases. At the peak of the increase, that's where the spine is weakest and the top of the arrow, at that position, is stiffest. I mark it, fletch it and forget about it.
Originally Posted by Perry24
By the way, I used Jim Hill's eye-bolt method at first and there's way too much movement with the bolt that goes through them. I used a 5/8" pvc pipe and shimmed it with screws to tighten up the tolerances so that there is no movement to the bolt that goes through it.
August 26th, 2011, 11:32 PM
I thought I would post it up so people could see the chart if they want to see if an arrow matches it's advertise spine. If you just want to check for the stiff side, it isn't needed of course. I do like your design for how the weight touches the arrow and the use of bearings to make it easier to spine.
August 27th, 2011, 12:05 AM
Hello All, very nice. [ Later
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September 6th, 2011, 12:57 AM
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September 6th, 2011, 03:00 PM
Fine design. Good execution I've seen simpler devices to find the soft axis. Orienting on softspine is also useful for the same reasons, but stiff orientation seems better to me. Also you can find the "bad apple" in the arrow bin.
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September 23rd, 2011, 04:03 PM
Does spine need to be tested at a 28" pan...
can you take a cut arrow (for me between 26.5 and 28") and use like a 24" span instead?
September 23rd, 2011, 04:47 PM
Here are some instructions I stole and posted a while back. I did make one, but wasn't too pleased with how it turned out for me. i bought a RAM products tester, which will also test broadhead runout which is nice.
sine labore nihil