A method and an apparatus for measuring a tapered cylindrical object, such as a mandrel. The apparatus employs a linear positioning table assembly with a slide mounting for a laser micrometer, an axial position stepper motor for moving the laser micrometer stepwise along the axial length of the mandrel,...http://www.google.fr/patents/US5563808?utm_source=gb-gplus-shareBrevet US5563808 - Pilger mill mandrel measuring device
