Abstract: The present disclosure teaches a process and related apparatus for longitudinal adjustment of tools for individual working spindles of a multiple-spindle automatically controlled machine tool. The tools introduced into the working spindles in the direction of their lengths to be adjusted are run in rapid advance in all cases against a measuring device which, on reaching a predetermined distance from the working part reference point, produces a first signal in which the rapid advances of the working spindles are switched off individually. The first signal from the measuring device finally reached by the tool involved switches on crawling speeds for all working spindles. The spindles are switched off individually on reaching the working-part reference points in all cases by a second signal from the measuring devices.

Abstract: A tool-changing apparatus for a multiple-spindle milling machine having a gantry covering a working-part table. Individual working spindles are movable from working positions side by side in unison in a tool-change position laterally from the working-part table. Tool-gripping devices are movable between a delivery station and the working spindles in the tool-change position among which each gripping device is turnable and is arranged in said change position of each of the working spindles. The gripping devices are each arranged at a separate swinging device which is movable at least in a direction of a connecting line of the working spindle or parallel thereto in relation to the swinging devices of other of the tool-gripping devices.