These are the step-by-step instructions for a simple LEGO pulley-belt model. This model demonstrates pulleys and belts, and is appropriate for the classroom. Students can connect input pulleys to output pulleys using a rubber band as a belt.
The input may be a small pulley or a medium pulley, with the associated output being either a small pulley or a medium pulley. This awesome model can serve as a base for a belt drive robot! This model utilizes common LEGO components.

Get a move on and start building!