This pneumatic machine tool includes a driving shaft (14) driven in rotation by pneumatic drive means (12), a driven tool-carrier shaft (16), a gear mechanism (18) disposed between the driving shaft and the driven shaft to drive the latter, a set of sensors (22) for measuring operating parameters of...http://www.google.fr/patents/US6343900?utm_source=gb-gplus-shareBrevet US6343900 - Two-speed pneumatic machine tool
