Abstract: A pneumatic machine tool includes a telescopic spindle having a drive shaft driven in rotation by a pneumatic motor. A hollow shaft is slidingly mounted on the drive shaft. A tool holder is associated with the hollow shaft and is driven in translation by a control device. The control device includes a carriage driven in translation by an endless screw via a nut carried by the carriage. The endless screw is driven in rotation by an electric motor. The character is provided with a force sensor designed to measure the thrust exerted on the tool holder and connected to a central processing unit in which is stored an algorithm for processing the signal delivered by the sensor and for monitoring the advance of the tool carried by the spindle.

Abstract: This pneumatic machine tool comprises a telescopic spindle (18) having a drive shaft (28) driven in rotation by a pneumatic motor (14) and on which is slidingly mounted a hollow shaft (36) with which a tool holder (30) is associated and which is driven in translation by control means (24) comprising a carriage (38) driven in translation by an endless screw (42) via a nut (40) carried by the carriage (38), the said endless screw being driven in rotation by an electric motor, and is characterized in that the carriage is provided with a force sensor (52; 55) designed to measure the thrust exerted on the tool holder (30) and connected to a central processing unit in which is stored an algorithm for processing the signal delivered by the sensor and for monitoring the advance of the tool carried by the spindle.

Abstract: This pneumatic machining machine comprises a toolholder spindle (14), pneumatic drive means ensuring the drive of the spindle (14) and a central unit (16) which stores programs for controlling the drive means for the execution of machining cycles as a function of the type of tool held by the spindle (14), said spindle (14) being equipped with means (20) for coding the type of tool which it carries, and the machine being provided with means (28) for reading the coding means, which are connected to the central unit (16) in order to supply the latter with information relating to the tool fitted to the spindle. The coding means (20) are arranged in the form of a set of grooves forming an optical code, and the reading means (28) comprise sets of optical fibers for detecting the presence of the grooves.