Robotics Education & Competition Foundation
Inspiring students, one robot at a time.

Four inch curved FLYWHEEL cover


Entry ID #: 2602
Created: Wed, Jan 13, 2016 7:35 AM

NEW CURVED FLYWHEEL - FOUR INCH WHEEL COVER       I came up with the idea for a flywheel with a convex wheel after seeing my teammates’ effort. The ball and normal wheels have few points of contact so they had to load the wheel up with rubber bands. One even tried a convex shape with rubber bands. 9364B’s wheel maximizes surface contact to make as many points of contact as possible for idealized shooting and accuracy.     The flywheel could be used as a single or double flywheel. With gearing, it could be really fast and full court shoot. With rubber wheels, they also function as normal wheels for reuse in next year's game. The new design involves a four inch wheel cover, so there is no need to get a full wheel, just replace the covers on two wheels. The cover fits as well as any other does, making it easy and versatile.     I first opened several wheel files in Inventor to see how they were designed and assembled. I mirrored the size of the five inch wheel. After drawing several circles, a place for the shaft to go, and a star shape for structure, I made squares that extend pass the circle to mirror the slots on the other wheels. After extruding the design by two inches (radius of ball), I filleted all the edges for a smooth look. Then I went back and redid the design. I wanted it to be easier and more versatile to use. So I decided not to make full wheels, but wheel covers for the four inch wheel hub. I modeled the interior slot area after the four inch wheel cover’s interior to make it fit. I extruded the design and chamfed one edge to match the original cover’s edge. Then I drew a four inch circle to represent the ball and lined up the center with one side of the wheel. On the other side I drew a line down to get a shape to extrude. I revolved the triangle outside the circle around the z axis. To match the wheel hub, the wheel could only be so wide. For structural integrity I couldn't make one flywheel because to have the best curve, it would make the wheel too wide. I opted for half of the curve to make one side of the full flywheel. After I finished that. I assembled two full flywheels. I had to make the side of each half flywheel cover flush to make one flywheel. The wheel hubs are separated, but not much. The cover fit the hub perfectly. Then I added a ball to see how much surface area contact I had which was a lot. Finally, I took screenshots of Inventor.     I used circular and rectangular patterns and polygons for the first time. Although I am familiar with Inventor and didn't learn many new features, I did learn how to model quicker. There are a hundred ways to model any part and picking the quickest one makes life much easier. If I used revolve more I would have saved time. It's best to pick the most efficient way to model. I will continue to model in the future, both for fun and for engineering. I can model my robot in Inventor. A design in CAD is clearer than any picture could be. Learning CAD will help me in the future because engineering requires design and CAD is one wonderful way of designing things. Also, it’s a great skill to have because I can make and print anything I set my mind on. New half-cover Original four inch wheel cover   Cover in a solid color to show detail. 


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