Abstract: The invention relates to a machine tool having two spindles driven and controlled by servomotors (1), (2) by supplying velocity control circuits (3), (4) with velocity commands (Vcmd.sub.1), (Vcmd.sub.2) for independently controlling the rotational velocities of first and second spindles. The spindles of a machine tool such as a lathe are controlled for synchronous operation so that the two spindles can be controlled in order to machine a workpiece efficiently. According to the invention, synchronous operation is executed efficiently upon achieving coincidence between the rotational angles of the spindles so that a workpiece can be regripped during rotation.

Abstract: A machine tool (100) has a spindle (101) and a turret or toolholder (124) which are disposed at the front of a base (134).A workpiece (W) is rotated by the spindle (101). The turret (124) is movable toward and away from the workpiece (W) along a path which has vertical and horizontal components. A conveyor assembly (200) is operable to move workpieces between the rear of the base (134) and the spindle (101) along a path (A) which extends through a plane (E) which contains the axis (C) of rotation of the spindle. The plane (E) is parallel to vertical and horizontal components of movement of the turret (123). An alternative embodiment (100a) of the machine tool includes a pair of spindles (101a, 301) and a pair of turrets (124a, 324) disposed at the front of a base (134a, 334). Workpieces (W9, W10) are moved two at a time between the rear of the base (134a, 334 ) and the two spindles (101a, 301) along a path which extends through a plane which contains the axes (C, J) of rotation of the spindles (101a, 301).

Abstract: In a method and a multiple-spindle automatic lathe for machining both sides of workpieces, in order to increase the number of spindle positions available for machining the workpieces, it is suggested that the spindle drum be indexed in single steps, that the feeding of raw workpieces, the removal of finished workpieces and the changeover of half-finished workpieces be carried out in a single spindle position of the spindle drum and that the feeding of raw workpieces and the removal of finished workpieces occur alternately after each drum indexing.

Abstract: A multiple spindle bar machine which includes a carrier rotatively supporting a plurality of spindles. The carrier is rotatable to index the spindles to a successive work station. Separate spindle drives supported by the carrier are provided to rotate each spindle independently of each other spindle. Each spindle drive includes a motor supported by the frame and a clutch assembly for transferring rotative motion from the motor to the drive means. Each clutch assembly includes two clutch plates which are separable to allow rotation of the carrier to index the spindles.

Abstract: A control device for feeding metal bars to a multispindle automatic lathe comprises a rotating drum which bears a plurality of bar pushers arranged peripherally and equidistantly from each other, control means being associated with said bar pushers. In accordance with the invention said control means consist of a hydraulic motor for each bar pusher, said motor being fixed to said rotating drum. Fluid under pressure is fed selectively to at least one or more of said hydraulic motors, depending on the feed requirements, through a unit which comprises a distributor designed to place in communication fluid delivered under pressure with said at least one or more motors during rotation of the drum to which it is constrained.

Abstract: A multispindle lathe comprising a rigid, stationary frame, a drum mounted for rotation on the frame, indexing means for indexing the drum relative to the frame about its axis of rotation, a plurality of driven spindles carried by the drum with their axes parallel to and spaced about the axis of rotation of the drum, each spindle being equipped to carry a workpiece, and, a plurality of tool mechanisms carried by the frame and disposed around the axis of the drum for machining workpieces carried by the main spindles, a secondary spindle facing towards said main spindles and having its axis of rotation parallel to the axes of rotation of said main spindles, said secondary spindle being equipped to grip the portion of a workpiece protruding from one of the main spindles, a two axis slide system carried by the frame of the lathe and supporting said secondary spindle whereby said secondary spindle can be moved in directions axially towards and away from, and transversely with respect to the axes of the main spindle

Abstract: The conventional multiple-spindle automatic lathes are expensive on account of their complicated construction, and the production output and production possibilities are limited on account of the restricted number of work spindles utilized. The novel automatic lathe is to offer higher production outputs and more universal manufacturing possibilities with a simpler construction.The basic structure of an automatic lathe with eight tool spindles (10) for the manufacture of workpieces in eight successive machining stations resides in that, additionally to the number of basic tool stations (1 through 8), each basic tool station, except for the first, is once more included as an additional tool station (2 through 8) arranged in the same sequence of machining upstream of the basic tool stations (1 through 8) so that the total number of machining stations amounts to N=2n-1, a loading and unloading station being provided at the tool station (1).

Abstract: The process for securing a machine tool bed to a base includes the steps of providing a base having a horizontally disposed first surface wherein a plurality of cooperating grooves are disposed. A selected quantity of hardenable grout material is deposited into the grooves. A bed has a second surface from which a plurality of tongues extend, and each tongue has side surfaces which are relatively rougher than the associated distal surface. The bed is horizontally positioned above the base so that each tongue is received in an associated groove and each distal surface is spaced from the associated underlying groove, thereby causing the grout material to rise by an amount insufficient to contact the second surface. The bed is maintained spaced above the base until the grout material has hardened and thereby binds each side surface but not the associated distal surface to the base.

Abstract: A machine tool comprises two workpiece spindles having a spindle axis and located axially opposite to one another, at least one of the workpiece spindles being movable in an axial direction for transferring a workpiece from a clamping location to a working location, at least two tool carriages which are movable independently of one another parallel to the spindle axis and perpendicular to the spindle axis, guides arranged at opposite sides of the spindle so that tools of both the tool carriages can work both a workpiece held in one of the tool spindles and a workpiece held in the other of the tool spindles, two revolvers each arranged on a respective one of the tool carriages and provided with a plurality of tool receptacles, one of the two revolvers having a switching axis which extends perpendicular to the spindle axis, while the other of the two revolvers has a switching axis which extends parallel to the spindle axis, and the tool receptacles of the revolvers are formed so that the tools in both two revol

Abstract: A complex machine tool has a single frame having a chip collecting space at a center portion thereof, first and second spindle stocks on the frame, relatively free to move and drive in a Z axis direction and holding the chip collecting space therebetween, workpiece spindles on the spindle stocks free to rotate and drive and facing each other, and tool rests. The tool rests have turrets and can assume various kinds of movement. Complicated and varied types of machining can be performed combining the rotation control of the workpiece spindles and the spindle stocks.

Abstract: A method and means for accurately positioning a tool slide in an automatic machining apparatus. Said method and means utilizing a fluid operated drive means, a linear position detecting means, an encoder means operatively associated with said linear position detecting means, means for controlling fluid flow to said fluid operated drive means and a programmable controller means for receiving and storing control data information and for receiving coded information for comparison to said control data information and for outputting a signal to control the operation of said fluid drive means.

Abstract: A machine is accomplished comprising two pairs of operating heads in which each pair includes two identical operating heads essentially opposite to each other equipped with chucks rotating on horizontal axes having at one end a conical housing for receiving a tool.Each head can be moved longitudinally and vertically and the corresponding conical housing faces a central cavity.A machining tool or a clamping tool for holding the part to be machined can be inserted into each housing, so that one or two opposite chucks support the part while it is machined by the tool or by the tools inserted into one or more of the remaining chucks.

Abstract: A multi-spindle lathe includes a pair of main spindles, a first spindle being located on one side of a main spindle head and a second spindle being located on an opposite side of the main spindle head. A supporting shaft extends through the main spindle head, and the head is selectively engageable with a head stock. The head stock is provided with an assembly for rotatably driving either of the main spindles when such spindle is positioned below the main spindle head, in order that a workpiece can be operated upon, while the spindle is positioned above the main spindle head in order for a workpiece to be attached or detached.

Abstract: Automatic turret lathe with a synchronous spindle in the tool turret which is drivable in synchronism with the main spindle and comprises a workpiece chuck means. To enable workpieces to also be worked on the rear side, i.e., on the side on which they were severed from a stock rod, while the next workpiece held in the main spindle is already being machined with the aid of a further tool carrier, a third tool carrier is arranged on the side of the tool turret mounted on a compound slide system facing away from the main spindle.