Patent ID: 7555970

Claim:
An apparatus for pointing a device at a target comprising, a base for engaging a mounting surface; a first rotational mount for supporting the device that is connected to the base having a circular gear that rotates about a first axis; a first motor for driving a first self locking worm gear that engages the circular gear; a second motor for driving a second self locking worm gear that engages the circular gear; a first sensor for detecting a rotational position of the first worm gear; a second sensor for detecting a rotational position of the second worm gear; and a motor controller for controlling the rotation of the first motor and the rotation of the second motor and making corrective adjustments to the rotation of the first motor or the second motor based upon variations between the rotational position of the first worm gear detected by the first sensor and the rotational position of the second worm gear detected by the second sensor; wherein the motor controller aligns the first self locking worm gear into calibration with the second self locking worm gear before the first motor and the second motor rotate synchronously to rotate the circular gear about the first axis and the motor controller causes the first motor to rotate asynchronously relative to the second motor to reduce the hysteresis of the circular gear and lock the circular gear in a stationary position.