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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="ntsqd" data-source="post: 1939443" data-attributes="member: 93138"><p>Very informative. It opens up new ideas to explore, for sure. I've been pondering the need for the force gauge on an arbor press. Now I see clearly why I want it.</p><p></p><p>"Stiction" is what we call Static Friction around these parts.</p><p></p><p>Does the motor change speed with changing resistance, or are we simply hearing the change in load on the motor? It's a pretty fine distinction because the motor is reacting to the change in resistance and once it does the region where speed is maintained is pretty narrow. I believe that we are seeing some of both, which is probably worse.</p><p></p><p>Repeating the test with a much stronger motor and over-laying the graphs would be illuminating. I'm guessing it was the classic Engineer's mistake of being too conservative. The lesson my work has taught me is that it is easier to scale back the available force than it is to try to increase it. That is to say (as one of my mentors is fond of saying) "it is easier to hit something lightly with a big hammer than it is to hit something hard with a small hammer". The motor chosen had too small of a margin over the predicted max effort needed.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1939443, member: 93138"] Very informative. It opens up new ideas to explore, for sure. I've been pondering the need for the force gauge on an arbor press. Now I see clearly why I want it. "Stiction" is what we call Static Friction around these parts. Does the motor change speed with changing resistance, or are we simply hearing the change in load on the motor? It's a pretty fine distinction because the motor is reacting to the change in resistance and once it does the region where speed is maintained is pretty narrow. I believe that we are seeing some of both, which is probably worse. Repeating the test with a much stronger motor and over-laying the graphs would be illuminating. I'm guessing it was the classic Engineer's mistake of being too conservative. The lesson my work has taught me is that it is easier to scale back the available force than it is to try to increase it. That is to say (as one of my mentors is fond of saying) "it is easier to hit something lightly with a big hammer than it is to hit something hard with a small hammer". The motor chosen had too small of a margin over the predicted max effort needed. [/QUOTE]
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