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project-description - ME250 W09 Project Self-Propelled...

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ME250 W09 Project Self-Propelled Miniature Vehicle Design and Manufacture 1. Objective The objective of this project is twofold: to improve your appreciation of the capabilities and limitation of basic machining processes -- turning, milling, and drilling -- through hands-on experience with CNC machines; and to exercise your ingenuity in designing, building, and testing a device that meets prescribed functional specifications using only limited resources. After the completion of the project, you will gain an experience in working as a team to solve an open-ended engineering design problem, and to deliver a manufactured product by a specified deadline. 2. Design specifications You are requested to design and build a self-propelled miniature vehicle capable of climbing up an inclined plane in accordance with the following specifications: It must use and carry the supplied DC motor, gear box, battery holder and switch. It must have at least two rims for the wheels and chassis made of PVC or epoxy using ME250 CNC lathes and mills. It must not use off-the-shelf wheels, tires and/or rims, such as the ones for toy cars, either as they are or modified. It must use only two 2 AA batteries as energy supply. It must not use adhesives (eg. tapes or glues) to contact the inclined plane or side walls. It must not damage or otherwise alter the surface of the inclined plane. It must fit in the interior of an 8 X 6 ” X 5 box for shipment purposes It must stay within the designated 12” wide lane during the climbing (can contact side walls). It must be aesthetically pleasing to satisfy demanding customers Each team's vehicle will be evaluated by means of a sequence of climbing tests on a special test rig, whose schematic is shown in Figure 1 (a). The test rig is an unfinished plywood board with an adjustable angle of inclination, divided into four lanes separated by side walls --- it is designed to test four vehicles simultaneously. The overall length is 3 feet and the width of each lane is 12 inches. On each lane, there are two bumps with 0.5 inches in height made of plywood pieces attached on the lane as shown in Figure 1 (b). The slope of the inclined plane is not specified a priori -- rather, you are requested to design a vehicle that can climb a slope as steep as possible . Accordingly, each vehicle will be tested at the increasing slope angles =10 o , 20 o , 30 o , … The speed at which the vehicle climbs the slope is also a design target.
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