Hi...Do anyone knows about microbearings and how to calculate the thrust and torque for this rig.Thanks. _________________________________________________ Mohamad Faizal Ahmad Department of Computing & Electrical Engineering Heriot-Watt University ceemfa@cee.hw.ac.uk Tel : +44 131 449 5111 Ext 4162/3908 Fax : +44 131 451 3431 _________________________________________________