Abstract: A laser machining device comprises a movable stage which is controlled by a stage controller. A laser produces a beam for machining and the beam is scanned over the part using a laser scanner under control of the laser scanner. The scanner controller controls the stage controller to synchronize movements of the stage with movements of the scanner. The stage may carry the part to be machined or the scanner.

Abstract: A servo-drive system for feedback-based control of motion and positioning of a motor comprises a current measurement device that obtains a measure of current being drawn by the drive motor from which to provide feedback. The current has an operating range which is made up of a relatively large current range for acceleration but remains within a relatively smaller current range for steady state operating of the motor. The current measurement device has a first, coarse, sensor optimized for measuring the relatively large current range and a second, fine, sensor optimized for measuring the relatively smaller current range, thereby to maximize feedback accuracy during steady state operation.