DEVELOPMENT OF STEM KITS FOR ENGINEERING STUDENTS

Abstract

The aim of this project was to make STEM Kits that could be used by engineers for their learning and practical demonstration of theoretical concepts. These kits were made by blending the experimental apparatuses and STEM kits by combining their pros and overcoming their cons to provide a better learning experience. Salient features of these STEM kits are that they are multi-purpose, portable, modular, compact, provide us with digital measurements and have parts with flexible usage. We focused on several variations two kinds of experiments: 4-bar mechanism and gear train. The method we used in this project was first to make an innovative design according to our needs and requirements with some preliminary calculations followed by animations, FEM simulations and advanced calculations while continuously improving the preliminary design through iterations. Some potential materials were identified and after careful consideration we selected best material for every component. Modern software tool used in this project include SolidWorks, Linkage, Mathcad and Excel. After the mechanical design was finalized, to have control on input motor so that we can vary the speed at which our primary shaft or input point rotates and to measure the RPM of various rotating shafts in gear train and 4-bar assemblies for which we designed electrical circuit and components for operation of our STEM KIT. All components including motors and sensors were selected after careful consideration. The electrical circuit is simulated in Proteus Design Suite. The results of animations and simulations showed that the requirements were fulfilled. In animation, no hindrance was observed in motion. Also, in simulation, stress was higher than yield stress and no buckling was observed. Working of electrical circuit was also verified in Proteus.