Robotics Education & Competition Foundation
Online Challenges

Dual Bearing

2

533183
Entry ID #: 5328
Created: Wed, Jan 10, 2018 8:54 AM


When our team is designing a robot, occasionally we run into a problem where we need to have an axle on the robot and we can’t fit two pieces of metal together. In order to solve this we designed a part that acts like a bearing but instead of only having one point of contact when attached to a piece of structure it will have two points of contact. We called it the dual bearing which is a 1 inch piece that holds an axle through two holes in the center with a space that allows a shaft collar to fit in and provide stability, and it comes as a plastic or metal material. The metal version is threaded and 8/32 size screws shorter than an inch can be used to attach the piece to metal structures on the robot, while the plastic version is not threaded and needs 8/32 size screws longer than one inch in order to be attached but it gives optimal movement to the axle.This will help our robot by increasing stability, efficiency of the motors, and saving parts for other teams. We modeled our piece on Autodesk Inventor 2016. First we extruded a rounded rectangle four-sixteenths of an inch, then two .437 inch cylinders were extruded on each end of the rectangle. Afterward, another rounded rectangle was extruded up four-sixteenths of an inch across the two cylinders and lined up with the original rectangle. To finish off the bearing, a lengthwise hole was made going completely through each cylinder and another hole went through the center of both of the rounded rectangles. The same steps were taken in order to create the metal version, but the two lengthwise holes in the cylinders were threaded in order for the part to be secured using screws. We learned that structural support for axles needs to be sturdy enough to withstand a substantial amount of force but also needs to be able to have the axle move freely with minimal resistance. This information led us to making the part with both plastic and metal, the metal version having threaded holes for screws and the plastic model with smooth holes made out of a material softer than the axle’s metal. In our future careers as engineers, we could use 3D modeling to design a solution for a problem in the field that could be edited by multiple people and can be 3D printed in order to have an early prototype. 3D modeling can help a competitive robotics team by allowing a team to have a visual representation of an idea or robot and letting them modify any changes that might need to be made to a design before the design is built. This would save crucial time by avoiding constant rebuilding in order to make the changes with the physical design.

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