Abstract: A spindle lock-up device for detachably locking a rotary spindle having a tool holder at its end to a non-rotatable support, such as the ram of a vertical boring machine, so that the spindle tool holder also may be used as a fixed tool holder for the ram, the device having a first spiroid gear member fixed to the ram, a second spiroid gear member surrounded by the first gear member and fixed to the spindle, and a third spiroid gear member surrounding said spindle and mounted for axial movement from a retracted to an extended position, the third gear member simultaneously engaging the first and second gear members when in the extended position to lock the spindle against rotation relative to the ram, the third gear member being moved to the extended position by a displaceable piston.

Abstract: An improved machine tool includes an extendible ram or tool support arm. As the ram is extended, the outer end portion of the ram deflects downwardly under the influence of gravity. To compensate for the deflection of the ram, the angular orientation of the ram relative to upwardly extending tracks is changed to raise the outer end portion of the ram. This is accomplished by means of gibs or deflection compensation cams which are moved to rotate a carriage or saddle on which the ram is mounted. The extent of deflection of the ram varies as a function of the distance which it extends outwardly from the carriage. Therefore it is necessary to store data indicative of the deflection of the ram at various degrees of extension and to adjust the orientation of the ram in accordance with this data as the ram is extended. The data indicating the extent to which the ram deflects is stored by means of a cam mounted on the carriage. The cam is read by a transducer which moves with the ram.