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Discussion Starter #1
I was given several aluminum arrows which are not identified with sizes i. e. 2315 etc.

Is there an easy way to determine the exact size. I can caliper to determine the difference in 22, 23 and 24's, but what is a good way to tell a 2215 from a 2216 or a 2312 2314, 15 and I have others....

I tested some by using inserts, but I don't have inserts for every size arrow.

There are so many that weigh close to the same weight and just a little bit in the length can make the weight change enough to be confusing....

Any solution????
 

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The second pair of numbers is the shaft wall thicknes in 1000 of an inch. Remove the insert and use your calipers to measure the wall. By the way, the first pair of numbers is the diameter measured in 1/64th of an inch.
 

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Discussion Starter #3
How does one measure a round shaft wall for thickness with a caliper?
 

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Pull the insert and use the "Outside" part of the caliper. Close it up anywhere around the mouth of the shaft. You are measuring the shaft wall thickness.

I hope this helps.
 

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IF THESE SHAFTS ARE IN SUCH A CONDITION THAT THE IDENTIFYING NUMBERS ARE MISSING, YOU MAY HAVE ISSUES WITH ACCURACY. ALSO, YOU COULD TRY TO PULL AN INSERT. MANY TIMES THE INSERT WILL SAY 2413 OR 2315 OR ETC...
 

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Discussion Starter #7
I spin tested them and keep the ones that are straight.....good idea with the possibility of numbers on the inserts.....sometimes they are only ink stamped and some I have are carbon inserts....

I will inspect them again shortly.

I appreciate all the good ideas...

Thanks,
 

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If you have trouble getting an accurate wall thickness with your caliper you can take the outside diameter minus the inside diameter divided by 2 to get wall thickness. Sometimes its tough to get an accurate wall measurement depending on how thick the jaws of the caliper are on the round surface.
 

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Discussion Starter #9
Finally got them all figured out through the suggestions received and weighting individual bare shafts.

I made several test arrows and will try them this Spring.
 
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