How to spin test an arrow?
08-17-2003, 07:07 AM
#1
Thread Starter
Join Date: Feb 2003
Location:
Posts: 2,413
How to spin test an arrow?
I' d like to know the proper procedure for spin testing.
I took some arrows to the local shop and used their Arizona Archery Arrow Straigtener. This tool seemed to be a fine instrument, but I' m not sure if it' s meant to " spin test" . The dial indicator is accurate to .0005"
I took some Gold Tip XTs and the group of six were all within .002" . However, I realized that was only over approximately 12" of arrow shaft. The rollers will not extend to the ends of the arrow. It seems I can only determine the wobble between two points, that are rather close together. I am assuming that the manufacturer tolerance of .003" , is over it' s entire length.
I also tested some Gold Tip Hunters that were in the shop. Interestingly enough, they tested out to be within the same tolerance as the XTs. I wonder if this was simply coincidental or if the green label of the XT, is not worth the extra price.
Can anyone give me the proper procedure for checking straightness against the manufacturer stated tolerance?
I took some arrows to the local shop and used their Arizona Archery Arrow Straigtener. This tool seemed to be a fine instrument, but I' m not sure if it' s meant to " spin test" . The dial indicator is accurate to .0005"
I took some Gold Tip XTs and the group of six were all within .002" . However, I realized that was only over approximately 12" of arrow shaft. The rollers will not extend to the ends of the arrow. It seems I can only determine the wobble between two points, that are rather close together. I am assuming that the manufacturer tolerance of .003" , is over it' s entire length.
I also tested some Gold Tip Hunters that were in the shop. Interestingly enough, they tested out to be within the same tolerance as the XTs. I wonder if this was simply coincidental or if the green label of the XT, is not worth the extra price.
Can anyone give me the proper procedure for checking straightness against the manufacturer stated tolerance?
08-17-2003, 09:50 AM
#2
Join Date: Jul 2003
Location: Tulsa, Oklahoma
Posts: 1,051
RE: How to spin test an arrow?
Most manufacturers only list their straightness tolerances over a specified length. I believe Easton' s are for only 28 inches of the shafts.
Spin testing is done for assuring your broadheads (and in the old days, glued on nocks) were true to the shaft. You don' t need the gauge for that. You can eyeball it. Spin the arrows on the rollers and see if you can detect any wobble at the tip of the broadhead.
Good luck.
Spin testing is done for assuring your broadheads (and in the old days, glued on nocks) were true to the shaft. You don' t need the gauge for that. You can eyeball it. Spin the arrows on the rollers and see if you can detect any wobble at the tip of the broadhead.
Good luck.
08-17-2003, 11:36 AM
#4
Giant Nontypical
Join Date: Feb 2003
Posts: 9,175
RE: How to spin test an arrow?
Most people do not have access to the equipment they need. You have to have presicion rollers or V-blocks that are spaced exactly the distance specified by the manufacturer, on a precision granite surface plate and a dial indicator.
I' m lucky that I have access to the tools, at least sometimes. My brother-in-law owns an aerospace machine shop.
I' m lucky that I have access to the tools, at least sometimes. My brother-in-law owns an aerospace machine shop.
08-17-2003, 09:14 PM
#5
Join Date: Feb 2003
Location: Baltimore Maryland USA
Posts: 1,385
RE: How to spin test an arrow?
Danny explained what I' ve been seeing. The last inch or two of both ends of the arrow can be seen not to be true to the centerline of the shaft. Since I' m seeing it more on the pressed-in nock end, I' m beginning to suspect the pressed-in nock system. I know that I' ve got some arrows where I installed the ACC-60 G-nock adapters and they still spin true after years of shooting. This may be a blind alley but it is worth mentioning.
