Procedure and device to eliminate roll about an axis of a coordinate measuring machine

摘要

The roll angle is eliminated with the aid of the beam (31) from a laser (30) via the Wollaston prism (42) which forms two coherent partial beams (31a, 31b) directed at surfaces of a translation reflector (33) fixed to the machine. The prism is fixed to the axis of the machine by means of a lever (40) at right angles to the axis and movable (8) in the direction of its length between two positions (Y1, Y2), The roll angle is determined from the two measurements with allowance for tilt of the measurement axis.