Does anyone know how to calculate the moment of inertia of a frustum? I need to workout the MOI of a taper, as in tapered cylinder bearings. Just as the cone in the picture below, the taper (frustum) is uniform and revolving about its longitudinal axis: I have found a couple of equations but I have nomenclature issues with them and I do not fully understand how to use them. This is the main ‘solution’ I found: http://answers.yahoo.com/question/index?qid=20060804212218AA5Ma9R There is a link to a RapidShare word file through that link that should explain it better, but my ISP (NTL) uses proxies and RapidShare therefore refuses to allow me to download anything from their site! Any help appreciated.