Hello Everyone, I am a university student. I wish to implement a system that generates energy from the user. I have the brief design sorted: A rectangular frame is used to support all the components and weights used A pulley system is used to provide a means for the user to pull a weight up and down The rotation of the pulley is transferred to a shaft The shaft is connected to a motor The motor is therefore run by the users energy The output voltage of the motor is fed into electronics where the resulting energy is stored I specifically require advice upon the mechanical aspect of this project. I wish to make a system that is: Efficient Feasible to implement within 3 months Can handle a weight of 10kg Current component parameters are: Motor with 15V rated output and 6mm diameter shaft Frame material is 45mm-by-45mm Rexroth beams I have provided some basic design sketches to give you a visual idea of what I am thinking: The first image is the frame. The second image is a basic representation of how I wish to connect the components together. Sorry but it is sideways, and must be rotated 90 degrees anti-clockwise. As shown in the second image, I wish to screw the motor under the middle beam, connect it to a coupling shaft, have the coupling shaft connect to the pulley, have the whole shaft supported by hook-like supports, and have the pulley rotate by having the cable pulled up and down by the user on one end and connected to a weight on the other. Please give feedback on my design, and I need better ideas so I can improve the project. I am primarily an electronics and electrical engineer so my knowledge in mechanical design is slightly lacking.