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In audiophile music they go through a process whereby they make sure that amps of the same type actually produce the exact same output when fed the same signal to keep the sound matched.
Could it be necessary to test the motors to make sure the same input produces the same output? e.g. power, rpm? Given the way the controllers work, the speed should be the same or the motor just won't run, but theory is one thing, reality is often something else.
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Necessity may be the mother of Invention but Desperation is quite often the father.
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Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid."
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