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crwdns2933797:0Andrew Bookholtcrwdnd2933797:0crwdne2933797:0

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[* black] Removing the speed sensor.
[* black] Aptly named, the speed sensor monitors the speed of the spinning shaft. Should things get out of hand, the sensor will shut off the motor.
+[* black] The speed sensor most likely uses the [link|http://en.wikipedia.org/wiki/Hall_effect|Hall effect] to tell the control circuitry how fast the shaft is spinning.