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For Experimenters - Determining Weak side of Shaft
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<blockquote data-quote="jon.henry755" data-source="post: 503577" data-attributes="member: 29115"><p>Hi Okiebowie,</p><p>If nothing else I have to hand it to you for your innovative thinking and your ability to construct homemade ways of doing different types of testing. You are by your own descriptions a true tinker which is what makes many of us engineering types similar. We believe that by closely examining almost anything, you can determine what makes it tick and then you can come up with a way to reconstruct it to perform better.</p><p></p><p>That said, today's Spine Testers are not built to identify the weak side of an arrow shaft. They are designed to first measure an arrows spine, then measure total spine deflection (which is the total shaft flexation from the shafts stiffest point through the softest point), lastly, they allow a person to accurately mark the exact stiff side or weak side of the arrows spine.</p><p></p><p>In relation to the newest generation of tapered arrow shafts, that is where are industry is definitely heading, but we also need to remember how and why an arrow goes through a deflection timing cycle. This is not static compression, but rather dynamic compression as the arrow is launched from its string or cable. I like the example of placing a 100 pound bowstring on one end and a bowling ball on the other end of the arrow. Where is the arrow shaft going to flex the most. Well, on a uniform arrow shaft, that will always be in the shafts exact center, but on a tapered shaft where different thicknesses are involved, it either moves the flex point slightly forward or slightly backward of exact center. It does not change where the stiff point or weak side of the shaft is located around an arrows circumference and we don't care so much where the stiff or weak side is along the arrows length, since we are matching each arrows deflection cycle close to its center since that's where the timing cycle that creates an archers paradox takes place.</p><p></p><p>More than anything else in the archery industry every manufacturer understands the need for greater accuracy through more consistency. They are not in the business of creating and manufacturing arrows that can not be matched in Spine, Deflection and Weight. These three elements are the corner posts of accuracy regardless if you are talking about arrows, spears, darts or anything else that shoots. </p><p></p><p>Remember that Easton Archery had 5 major manufacturing plants around the world and used a very expensive Spine Testing Meter in each plant to testing and sorting there arrow shafts for many years. They had an engineer that was assigned to install and calibrate these testers and maintain a very high standard of accuracy at each of there facilities. Manufactures don't make arrow shafts blindly. If they're making them, they have the tools to test them to insure they're getting the results they want. </p><p></p><p>They are not in the business of providing us with custom matched shafts other than to insure the Spine of the arrow is in the correct shaft range they are advertising, such as a .250 spine or a .350 spine. to get beyond that, it becomes our headache and the spine deflection meter is the only tool we have that is capable of performing the job to an acceptable degree. I repeat, an acceptable degree, since even the RAM Carbon Spine Testers require some minor modifications before they will operate smoothly. The meter head in the old Easton Spine Testers had much better bearings and sold for over $800. for just the head. The complete tester sold for over $1200. It's hard to compare that with a whole Spine Tester like the RAM that sells for under $300. As the saying goes, "you get what you pay for". The RAM can easily be improved, but I'll leave that issue to Super 91, since he's already completed those mod's and can provide more detail if anyone is interested in the details. </p><p></p><p>For the average TAC15 shooter, if you did nothing more than have your Spine Tested to mark the stiff side of your spines and then aligned your nocks so that the stiff sides were all in the same alignment to your nocks, you would improve your accuracy from arrow to arrow by a huge margin. If you then worked with a grain scale to match the arrow weights to with 1/10th of a grain (+ or - .3 grains), you would increase accuracy by 80 to 90 per cent. </p><p></p><p>We already know that within a year from now the technology used to custom fletch and build arrows will change once again. There are new vanes and new bonding methods under development that will likely have a major change on performance and the way we do things today. I'm not here to steal anybody's thunder or talk about the latest innovations, I'm just stating that the information provided in these forums is based upon the latest technology and information that's available to most of us today. </p><p></p><p>Jon</p></blockquote><p></p>
[QUOTE="jon.henry755, post: 503577, member: 29115"] Hi Okiebowie, If nothing else I have to hand it to you for your innovative thinking and your ability to construct homemade ways of doing different types of testing. You are by your own descriptions a true tinker which is what makes many of us engineering types similar. We believe that by closely examining almost anything, you can determine what makes it tick and then you can come up with a way to reconstruct it to perform better. That said, today's Spine Testers are not built to identify the weak side of an arrow shaft. They are designed to first measure an arrows spine, then measure total spine deflection (which is the total shaft flexation from the shafts stiffest point through the softest point), lastly, they allow a person to accurately mark the exact stiff side or weak side of the arrows spine. In relation to the newest generation of tapered arrow shafts, that is where are industry is definitely heading, but we also need to remember how and why an arrow goes through a deflection timing cycle. This is not static compression, but rather dynamic compression as the arrow is launched from its string or cable. I like the example of placing a 100 pound bowstring on one end and a bowling ball on the other end of the arrow. Where is the arrow shaft going to flex the most. Well, on a uniform arrow shaft, that will always be in the shafts exact center, but on a tapered shaft where different thicknesses are involved, it either moves the flex point slightly forward or slightly backward of exact center. It does not change where the stiff point or weak side of the shaft is located around an arrows circumference and we don't care so much where the stiff or weak side is along the arrows length, since we are matching each arrows deflection cycle close to its center since that's where the timing cycle that creates an archers paradox takes place. More than anything else in the archery industry every manufacturer understands the need for greater accuracy through more consistency. They are not in the business of creating and manufacturing arrows that can not be matched in Spine, Deflection and Weight. These three elements are the corner posts of accuracy regardless if you are talking about arrows, spears, darts or anything else that shoots. Remember that Easton Archery had 5 major manufacturing plants around the world and used a very expensive Spine Testing Meter in each plant to testing and sorting there arrow shafts for many years. They had an engineer that was assigned to install and calibrate these testers and maintain a very high standard of accuracy at each of there facilities. Manufactures don't make arrow shafts blindly. If they're making them, they have the tools to test them to insure they're getting the results they want. They are not in the business of providing us with custom matched shafts other than to insure the Spine of the arrow is in the correct shaft range they are advertising, such as a .250 spine or a .350 spine. to get beyond that, it becomes our headache and the spine deflection meter is the only tool we have that is capable of performing the job to an acceptable degree. I repeat, an acceptable degree, since even the RAM Carbon Spine Testers require some minor modifications before they will operate smoothly. The meter head in the old Easton Spine Testers had much better bearings and sold for over $800. for just the head. The complete tester sold for over $1200. It's hard to compare that with a whole Spine Tester like the RAM that sells for under $300. As the saying goes, "you get what you pay for". The RAM can easily be improved, but I'll leave that issue to Super 91, since he's already completed those mod's and can provide more detail if anyone is interested in the details. For the average TAC15 shooter, if you did nothing more than have your Spine Tested to mark the stiff side of your spines and then aligned your nocks so that the stiff sides were all in the same alignment to your nocks, you would improve your accuracy from arrow to arrow by a huge margin. If you then worked with a grain scale to match the arrow weights to with 1/10th of a grain (+ or - .3 grains), you would increase accuracy by 80 to 90 per cent. We already know that within a year from now the technology used to custom fletch and build arrows will change once again. There are new vanes and new bonding methods under development that will likely have a major change on performance and the way we do things today. I'm not here to steal anybody's thunder or talk about the latest innovations, I'm just stating that the information provided in these forums is based upon the latest technology and information that's available to most of us today. Jon [/QUOTE]
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