Abstract: A lathe, wherein its turret kinematically associated with a drive for its indexing, carries on its face a plurality of tool-holders and has a plurality of teeth on the peripheral cylindrical portion thereof, the number of said teeth corresponding to the number of the tool-holders, said teeth being adapted to interact with the actuating member of the mechanism for turret fixing in position. The turret indexing drive is essentially a reversible electric motor, and the turret fixing mechanism comprises a solenoid whose armature is associated, through a linkage, with the actuating member; provision is also made for a pickup adapted to monitor the turret teeth travelling through the zone of fixing, said pickup being electrically connected, through a switch, to the solenoid and motor control circuits.

Abstract: The straight turning automatic lathe whose bed carries a longitudinally movable spindle headstock with a bar workpiece and at least one secured upright carrying a cross slide with cutting tools. The upright is held motionless on the bed at a certain distance from the forward end face of the spindle head stock in its extreme advanced position and the cross slide is mounted on the upright side facing the forward end of the spindle headstock.