Gears System Design Challenge

Gears System Design Challenge - Gears System Design...

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Gears System Design Challenge Gear Systems Design Challenge Group# 03, Tatsuya Futai, Sean Elliott, Nick Jordan ENGR120 Section 2
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The purpose of the experiment was to design, build, test, and evaluate a gear assembly connecting the Lego motor and lift platform. The system should be capable of lifting the greatest possible mass in under 90 seconds. The power supply voltage must be set at 9 volts and the motor current must not exceed 200 milliamps during operation. Motor-Wheel Assembly In this portion of the experiment we were testing the motor wheel assembly which is just a direct drive system with no added gears or mechanical advantage. In this experiment we did three trials and recorded the time it took to lift a measured amount of salt. We were trying to find how much load (mass) our direct drive motor and wheel could lift. We were also trying to find the maximum torque produced by the motor, and the efficiency of the motor and wheel system with variable loads. Procedure: First we assembled the power supply, meter, direct drive motor assembly and lift platform as shown. We then connected our power supply to drive the Lego motor with voltmeter and ammeter connected for measurement. Next we measured and marked a line50 cm long to be our lifting height. From there we filled our Load Bottle with salt until mass is 100 grams total. We placed the Load Bottle in lifting position, and turned on the Power supply and test operation. Next we tested our voltmeter, ammeter and stopwatch operation for data collection. We then recorded our load Bottle mass (kg), motor Voltage (volts), motor current (milli-amps), distance raised (meters), time it to raise mass (seconds). We tested and recorded three different times for each weight attempted to lift. Assembly Direct Drive Trial Height Mass Time Mechanical Power Current Voltage Electrical Power Efficiency Torque # (meters) (kg) (s) (joules) (amps) (volts) (joules) (Pout/Pin) DD 1 0.5 0.1 1.174 0.417376 0.0769 9 0.6921 60.31% 0.012458 2 0.5 0.1 1.281 0.382513 0.0786 9 0.7074 54.07% 0.012458 3 0.5 0.1 1.32 0.371212 0.0781 9 0.7029 52.81% 0.012458 DD 1 0.5 0.2 2.11 0.464454 0.1609 9 1.4481 32.07% 0.024917 2 0.5 0.2 2.136 0.458801 0.1639 9 1.4751 31.10% 0.024917 3 0.5 0.2 2.137 0.458586 0.1609 9 1.4481 31.67% 0.024917 DD 1 0.5 0.25 2.469 0.496152 0.1947 9 1.7523 28.31% 0.031146 2 0.5 0.25 2.332 0.525300 0.1922 9 1.7298 30.37% 0.031146 3 0.5 0.25 2.517 0.486690 0.2066 9 1.8594 26.17% 0.031146 DD 1 0.5 0.35 n/a n/a 0.2968 9 2.6712 n/a 0.043605 2 0.5 0.35 n/a n/a 0.2964 9 2.6676 n/a 0.043605 3 0.5 0.35 n/a n/a 0.2653 9 2.3877 n/a 0.043605 Observations: of experimental procedures and results.
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1) The maximum mass of the object could be lifted by direct drive was 0.35kg . We found this through guess and check by adding and subtracting weights until we found a stall weight where our motor and wheel couldn’t lift any more weight. 2)
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Gears System Design Challenge - Gears System Design...

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