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<blockquote data-quote="J E Custom" data-source="post: 1967818" data-attributes="member: 2736"><p>Just for clarification of using load cells.</p><p>We looked into using load cells to measure recoil and as you said the cost was prohibitive. the affordable load cells could not handle the speed required to get consistent readings. they typically could not function properly. </p><p></p><p>Weatherby had Cal Tech built design and build one using the latest technological designed load cells and we checked on the price of these cells. $25.000.00 dollars was the average price of these high Tech cells and out of range for us. after talking to engineers at Weatherby and other businesses that used these load cells we found that there test and reported results proved that impact readings showed an average of 4 % variance reading to reading as apposed to static loads. static loading proved to be less than 1/1000 th with these load cells. so even though they were extremely accurate at weighting static loads, the performance was marginal for impact testing. So we had to come up with a more/very consistent way to measure if we were going to find subtle differences in design changes.</p><p></p><p>Fortunately, we were able to build a test bed that could and was capable of repeatable results with the capability of reading the Differences in velocity (SD ,s) agreeing with the chronograph.</p><p></p><p>We are no smarter than anyone else we were just result driven and luck to end up with a very precise measuring device that will/can indicate subtle changes/differences that can prove that many changes we made were for the worse and others were for the better. Something that can measure accurately without prejudice (Like a good chronograph) has to be consistently accurate.</p><p></p><p>So even if we could afford the high end load cells, we felt that the 4% repeatability percentage was to high for our needs. <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1967818, member: 2736"] Just for clarification of using load cells. We looked into using load cells to measure recoil and as you said the cost was prohibitive. the affordable load cells could not handle the speed required to get consistent readings. they typically could not function properly. Weatherby had Cal Tech built design and build one using the latest technological designed load cells and we checked on the price of these cells. $25.000.00 dollars was the average price of these high Tech cells and out of range for us. after talking to engineers at Weatherby and other businesses that used these load cells we found that there test and reported results proved that impact readings showed an average of 4 % variance reading to reading as apposed to static loads. static loading proved to be less than 1/1000 th with these load cells. so even though they were extremely accurate at weighting static loads, the performance was marginal for impact testing. So we had to come up with a more/very consistent way to measure if we were going to find subtle differences in design changes. Fortunately, we were able to build a test bed that could and was capable of repeatable results with the capability of reading the Differences in velocity (SD ,s) agreeing with the chronograph. We are no smarter than anyone else we were just result driven and luck to end up with a very precise measuring device that will/can indicate subtle changes/differences that can prove that many changes we made were for the worse and others were for the better. Something that can measure accurately without prejudice (Like a good chronograph) has to be consistently accurate. So even if we could afford the high end load cells, we felt that the 4% repeatability percentage was to high for our needs. 👍 :) J E CUSTOM [/QUOTE]
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