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Instructions on how to use the sunny day dynamometer to estimate the torque and rotational velocity of a small motor. A procedure for attaching the measuring disc, taking rpm readings, and calculating torque using the provided formula sheet. Safety precautions and tools required are also mentioned.
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Introduction: Thank you for choosing to use the Sunny Day Dyno. The Sunny Day Dynamometer is a simple tool which measures RPM. With the Sunny Day Dynamometer and a stopwatch, you will be able to estimate the torque and rotational velocity of a small motor. Please follow all instructions carefully and use the attached formula sheet to help you with your calculations. The Sunny Day Dyno development team recommends the use of eye protection, gloves, elbow pads, smiles, and common sense while operating the Sunny Day Dyno. Tools: The dynamometer is made of two pieces: a handheld contact tachometer, and an inertial disk. The inertial disc, or measuring disc, is brittle and should be treated with care. To attach the measuring disc to the tachometer, insert the tachometer shaft into the matching receptacle in the center of the disc until the small perpendicular alignment bar on the tachometer shaft is seated properly. A stopwatch is included for time measurements.
Procedure:
Calculating motor RPM is more simple. The motor and measuring disc are in direct contact, so their outer edges travel the same โdistanceโ while rotating. By comparing their circumferences you can calculate the RPM of the motor: RPM2r* (^) disc ฯ = RPM (^) motor2rmotor gear* ฯ or: RPM (^) motor = RPMr* (^) disc /rmotor gear Conclusion: Now that you have calculated the torque and rotational speed of your motor, all that remains is to calculate the propagation of uncertainly with partial derivatives and graph the instrument calibration with error bars. Just kidding! Thatโs next semester.