. one of successful computer controlled motion application is an implementation fo magneto-rheological materials in such drives. magneto-rheological fluids are a calss of materials whose rheological properties may be rapidly altered by applying a magnetic field 1. these materials usually are liquids with magnetically polarized ferrous particles suspended in a carrier liquid. the particle size in has on the order of micrometers and is 1–3 orders of magnitude larger than the same particles in ferromagnetic fluids [2]. Main interest to MRF is caused due to their fea-ture to change its viscosity from magnitude of applied ex-ternal magnetic field as well as liquid shape change. This feature makes MRF attractive to various commercial appli-cations, such as dampers [3, 4] and brakes [4, 5]. This pa-per is intended to evaluate possibility to utilize MRF for use in computer controlled actuators.