Technology developed for computer-controlled mirror manufacturing is described. The polishing tool is equipped with
electromagnetic force actuators to regulate the local polishing forces according to the measured mirror errors. Optical
testing with the interferometric modification of the Hartmann test and a CCD-camera as a detector allow accurate and fast
measurement with high sampling frequency. Air turbulence and vibration effects are minimized in the workshop which is
blasted into the bedrock and equipped with good thermal insulation.© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.