text: mechanical project? we are student of mechanical engineering doing diploma, we have to make a project whose cost will be minium(nearly rs. 2000/-) for that ($50 us?) you might build a working model.  something that helps people is often good, as in for the disabled.  i have something in mind, an arm driven walking device for someone with limited leg usage.  i have checked u s patents and found nothing similar.  will forward sketch upon request.  our senior design was awarded patent #5,104,280, drexel university, philadelphia, pennsylvania, usa, 1989.