Patent ID: 8393781

Claim:
An orbital shaker, comprising: a drive assembly including a base platform; at least three eccentric bearings mounted to the base platform with axes of the bearings being normal to the base platform, each of the eccentric bearings including an off-center posts, parallel to the axes of the bearings, that is connected via a respective mounting bearing to a drive platform; a controller mounted in the orbital shaker a motor controlled by the controller and drivingly connected via a motor pulley and a belt to a drive pulley connected to a first of the at least three eccentric bearings, the motor including a motor speed sensor, the motor being adapted to generate an orbital motion of the drive platform by a movement path of the off-center posts of the eccentric bearings; an actual speed sensor connected to a second of the at least three eccentric bearings, the motor speed sensor and the actual speed sensor generating speed signals that are transmitted to the controller, and the controller is adapted to compare the motor speed and actual speed sensor signals to calculate belt slippage and adjust a speed of the motor so that a desired actual speed is maintained; a shaking platform removably connected to the drive platform; a vibration sensor that detects a vibration level and transmits a vibration level signal to the controller, the controller is adapted to reduce a speed of the motor if a vibration threshold level is exceeded and transmit actual speed and time data for actual data log tracking.