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For Experimenters - Determining Weak side of Shaft
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<blockquote data-quote="OkieBowie" data-source="post: 500486" data-attributes="member: 26507"><p>Time to fess up, I goofed. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p><p>1) I was marking the strong side, not the weak. Thus the arrow with 180 degrees, was almost spot on (aka I got lucky with that arrow shaft).</p><p>2) As for the two with roughly 90 degrees, those turned out to be a combination of three problems: a) A case of not making the marks accurately, b) along with bad estimation on my part as to the difference in positions, and c) issues with using the home-built Spine Tester.</p><p></p><p>Credit goes to Dorge's Fletching Jig for helping to sort this out. All it took was putting the arrows in the jig with it set to 0-degrees and rotating the arrows to align their Spine Tester made marks with part of the Jig. Then setting the Jig to 180-degrees, and comparing the marks made via bar-clamp to same part on the Jig.</p><p></p><p></p><p>When at first you don't succeed, try again. There was indeed problems with using the home-built spine tester, besides the issue of making accurate marks. Two issues stood out.</p><p>1) I could get better results by looking for side of the shaft that most resisted bending (strong-side) from the hanging weights. <em>Not sure why.</em></p><p>2) The alignment (aka positioning to Top Dead Center) of the Dial Gauge to measure the arrow shaft's deflection took more care than I had realized. Along with using a different Tip on the end of the Dial Gauge.</p><p></p><p>One other thing I noticed was the arrow shafts did not always seem to deflect the same amount when rotated to find the least vs. most amount of arrow shaft deflection. The Dial Gauge itself may be part of the problem in that it takes a slight amount of force to move the needle. Perhaps due to its age and the mechanical workings. Likewise, once an arrow is bent, it does not take much force to slightly change the amount the arrow shaft deflects.</p><p></p><p>With all that said, it looks like using a bar-clamp to detect the weak-side of arrow does correlate with using a Spine-Tester. (Yeah !)</p><p>Based on the two methods, and without having used a Professional Spine-Tester, the Bar-Clamp methods seems to be easier and more accurate in finding the weak-side of an arrow-shaft. <em>Still the proof lies in consistent arrow placement when using different arrows.</em></p><p></p><p>In the prior post, I mentioned the real determination on arrow shaft bending would be to image what happens when an arrow is released from a TAC-15. <em>Still working on that.</em></p><p>The El-Cheapo camera I have responds to slowly to an external remote switch to capture an arrow upon release. Even setting the camera to manual everything, which also eliminates focus time, does not help. Thus leading to using an external flash coupled to optic trigger to capture the arrow shaft's dynamics just as it is released.</p><p></p><p><em>Cheers, its time for beers...</em></p></blockquote><p></p>
[QUOTE="OkieBowie, post: 500486, member: 26507"] Time to fess up, I goofed. :cool: 1) I was marking the strong side, not the weak. Thus the arrow with 180 degrees, was almost spot on (aka I got lucky with that arrow shaft). 2) As for the two with roughly 90 degrees, those turned out to be a combination of three problems: a) A case of not making the marks accurately, b) along with bad estimation on my part as to the difference in positions, and c) issues with using the home-built Spine Tester. Credit goes to Dorge's Fletching Jig for helping to sort this out. All it took was putting the arrows in the jig with it set to 0-degrees and rotating the arrows to align their Spine Tester made marks with part of the Jig. Then setting the Jig to 180-degrees, and comparing the marks made via bar-clamp to same part on the Jig. When at first you don't succeed, try again. There was indeed problems with using the home-built spine tester, besides the issue of making accurate marks. Two issues stood out. 1) I could get better results by looking for side of the shaft that most resisted bending (strong-side) from the hanging weights. [I]Not sure why.[/I] 2) The alignment (aka positioning to Top Dead Center) of the Dial Gauge to measure the arrow shaft's deflection took more care than I had realized. Along with using a different Tip on the end of the Dial Gauge. One other thing I noticed was the arrow shafts did not always seem to deflect the same amount when rotated to find the least vs. most amount of arrow shaft deflection. The Dial Gauge itself may be part of the problem in that it takes a slight amount of force to move the needle. Perhaps due to its age and the mechanical workings. Likewise, once an arrow is bent, it does not take much force to slightly change the amount the arrow shaft deflects. With all that said, it looks like using a bar-clamp to detect the weak-side of arrow does correlate with using a Spine-Tester. (Yeah !) Based on the two methods, and without having used a Professional Spine-Tester, the Bar-Clamp methods seems to be easier and more accurate in finding the weak-side of an arrow-shaft. [I]Still the proof lies in consistent arrow placement when using different arrows.[/I] In the prior post, I mentioned the real determination on arrow shaft bending would be to image what happens when an arrow is released from a TAC-15. [I]Still working on that.[/I] The El-Cheapo camera I have responds to slowly to an external remote switch to capture an arrow upon release. Even setting the camera to manual everything, which also eliminates focus time, does not help. Thus leading to using an external flash coupled to optic trigger to capture the arrow shaft's dynamics just as it is released. [I]Cheers, its time for beers...[/I] [/QUOTE]
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