I am thinking on an application where a DC motor has to rotate a wooden bar in the horizontal plane - motor spindle vertical. The bar will be about 4 metres long, weigh about 5kG and is balance about the rotation axis. Rotation speed a few RPM. How do I calculate the torque rating of the motor? --=20 __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .