Our yoyo is inspired by the Golden Snitch from Harry Potter. It will consist of two symmetric hemispheres for the body, two symmetric wings that rotate when it spins and a stand (reminiscent of the carrier box) with "I open at the close" engraved (from The Deathly Hallows). Design for ManufacturingOne of the primary factors we considered when designing our yoyo was the complexity of each individual part. The ring, shell, and wings will be injection molded due to the more intricate geometry and contours, whereas our simplest part, the stand for the snitch, will be thermoformed. This allow us greater flexibility with our most complex parts. We designed the shell to have mostly uniform thickness in order to preserve consistency and quality through injection molding. We included a space for bearings in the shell to facilitate movement of the wings. Because our shell has very fine contours, the mold will be 3D printed instead of machined. Since the base will not require the stiffness and precision of the other parts of the yo-yo, it will be manufactured through thermoforming. Assembly ProcessTo summarize the assembly process, the two body pieces will be connected via a screw fitting within a steel sleeve. Within the injection molded ring will be a nut, threaded to accept the screw, allowing the two rings to be connected with a distance between them equal to the string gap of 2mm. The two rings will be press fit into the inner grooves of the shells components . The wings will then be press fitted (with or without bearings/bushings) into two 1/8 inch cylindrical slots on the outer edges of the body. The assembled yoyo will then rest in the pocket of the stand to complete the full product assembly. Table of SpecificationsGantt Chart |
Six SeekersGroup of six MIT students fabricating a yo-yo that looks like the golden Snitch from Harry Potter. Archives
May 2017
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