Abstract: The disclosure relates to a tool changer which is disposed at a workpiece exchanger for machine tools. The workpiece exchanger is intended for automatic exchange of workpieces intended for fixedly clamping between the tailstock and/or chuck and comprises a carriage drivable in the longitudinal direction of the lathe, a slide vertically movable along the carriage, and a gripping device disposed on the slide. The gripping device is rotatable about a horizontal axis and has first and second jaw pairs which are horizontally shiftable parallel to and disposed on opposite sides of the above-mentioned axis.The tool changer according to the invention includes a pair of gripping means disposed on each jaw pair, the gripping devices of the gripping means being movable with the jaws for the purposes of tool change.

Abstract: An apparatus for measuring the position of the tool apex in relation to predetermined reference points in a numerically controlled lathe or the like comprises a clamp and an instrument, attached to the clamp, for establishing the position of the tool apex. The clamp is adapted, for its localization on the lathe, to cooperate with a recess provided in the spindle and concentric therewith, said clamp being provided, at least at its opposite sides, with abutments which are adapted to bear against the sides of the spindle recess. According to the invention the clamp is pivotally mounted on a holder therefor, said holder being movable, by means of a drive unit provided with an operating means, at right angles towards and away from the spindle just opposite the spindle recess, while the clamp is adapted to pivot, by means of a drive unit provided with an operating means, toward and away from the position in which it is situated just opposite the spindle recess.

Abstract: A tool turret according to the invention comprises a turret head which is shiftable between a rotational position and a working position, drive means adapted to rotate the turret head in the rotational position and being in permanent engagement with the turret head, fixation means for locking the turret head in the working position, and a transducer sensing the position of the turret head.The turret head is rotatable with respect to a non-rotary body which is axially displaceable with the turret head and which has a circumferential projection serving as a piston and being mounted axially displaceable in an annular recess serving as a cylinder and formed in a seat, receiving the body, of a member supporting the body. The projection and the annular recess cooperate with each other to ensure axial displacement of the body with the turret head between the rotational position and the working position.

Abstract: A turret toolpost preferably for numerically controlled automatic lathes includes two relatively adjustable turrets for the cutting tools, one turret being disposed outside the other turret. The axes of these two turrets make a small angle with one another.