Abstract: A method of and an apparatus for monitoring and programming functioning of a machine for machining workpieces, in particular, a spark erosion machine, in which separate functions are displayed on a window of the apparatus screen, one or more of the displayed functions is/are selected and then set up valuewise in a further window of the apparatus screen.

Abstract: An electro-erosion apparatus for the machining of workpieces with a work ruble for the resting thereon of a workpiece, a first machining head, at last two degree of from of the movement of the apparatus in and/or parallel to the principal working place of the workpiece (X/Y-plane) as well as at least one additional degree of from of the movement perpendicular to the principle working place (Z-axis), which has at least one additional machining head which is fastened on the first machining head (FIG. 4 ).

Abstract: Apparatus for and method of electro-erosive cutting with a cathode in the form of a wire. The wire advances through at least one or two guides, especially open V-grooved guides that do not surround the wire. One wire guide is upstream and the other downstream, in the direction the wire advances along, of the workpiece being processed. The wire guide or guides can rotate around the wire.

Abstract: Apparatus for electro-erosive cutting. A cathode in the form of a wire advances through at least one wire guide, with one guide being upstream and the other, if any, downstream of the workpiece in terms of the direction advanced by the wire. The at least one wire guide is an open, specifically a notched, wire guide, one that does not surround the wire, that is, and has associated with it a closed wire guide, specifically a wire guide in the from of a torus that surrounds the wire.

Abstract: At least two parameters (.delta., Inst) of which it is known that their variation influences the state of the spark erosion process (F, W) are fed to a logic device (5) in which a set of rules is stored. The logic device processes the parameters fed with the aid of the stored rules according to the laws of fuzzy logic, and generates at least one output signal (.epsilon.) which is fed to a controller (6) of at least one parameter, in order to match or at least approximate the currently prevailing state of the spark erosion process to a currently desired state of the spark erosion process.

Abstract: A method of electroerosive wire cutting at least one shaped piece in a workpiece, in which it is cut by a solid cut along a first path, at least one parting cut along a second path, and at least one finish cut along the first and second paths, the sequence of cuts being variable according to the operating conditions. The operating conditions can include presence of a user so that the parting cut is carried out upon the presence of the operator.

Abstract: The pulse generator for electric discharge machining contains neither load resistors nor magnetic components. The pulse current is continuously detected by a current sensor 4 and this measured value fed to a control circuit 5. Via switch elements 10, 11 and the spark-circuit inductance 3, the pulse current is developed in accordance with a desired value called for by the system connection 6. At the pulse end, the energy present in the spark-circuit inductance 3 is discharged into capacitors 37, 38 and from there recuperated in the source of dc voltage 1 or, upon the next current pulse, in the spark circuit 2, 3. This is possible with only two switch elements 10, 11. One terminal of the source of the dc voltage 1 is common with an electrode of the spark path. By means of further switch elements 12, 13, it is also possible to control the no-load voltage and/or the current impulse slope. This generator is particularly small, light and inexpensive and is of very high efficiency.

Abstract: A method for the initial cutting of a workpiece by electrical discharge cutting by a wire electrode, in which the values for the specific cutting parameters are reduced along an introduction path in the workpiece at least in part as compared with the values of the cutting parameters for the actual cutting contour, and at least some of the reduced values of the cutting parameters are continuously changed until the values intended for the actual cutting contour are reached.

Abstract: In order to filter out of the dielectric the microscopically small spherical particles removed by spark erosion [???] machines, a labyrinth filter is provided, containing at least one filter unit with a pressure receptacle (21) loosely filled with filter grains. The intake surface area is relatively small by comparison to the height of the column through which the liquid to be filtered flows, and the filter pump is matched to these two dimensions in such a way as to cause the dielectric to flow through the labyrinth at a rate of at least 2 meters per minute. This leads to the formation of low-pressure zones behind the individual filter grains, in which zones the microscopically small spherical particles removed by the erosion [???] process become trapped.

Abstract: To permit machining of workpieces on spark erosion cutting equipment with large angles of inclination, the guidance heads which guide the wire electrode in the cutting zone with respect to the workpiece are pivotably arranged and controlled, by being mounted on individual gimbal suspensions so that it is possible to provide for a controllable slope angle up to large amounts. Individual drive motors control movement about the respective gimbal axes.

Abstract: Erosive working machine for cutting prepared closed inner shapes (15) and closed outer shapes (16) of a workpiece (12) fixed by a workpiece holder by means of a filamentary or strip electrode (14) arranged on guidance means (13, 18). At least one guidance means (13, 18) is arranged on a motor-rotatable rotating mechanism (20) in such a way that the center line (23) of rotating mechanism (20) at at least one geometrical locus coincides with the center of the cross-section of electrode (14). Thus, during the erosion process, a collision between the guidance means (13, 18) and the closed inner shape (15) or closed outer shape (16) or a tool holder (11) is avoided.

Abstract: The disclosed method includes forcing a flushing medium through the work zone in the workpiece in one direction by providing a flushing chamber to one side of the workpiece where the workpiece is being machined.Also disclosed is an apparatus for practicing the method. The apparatus includes means for forming a chamber on one side of the workpiece and for effectively covering portions of the chamber walls which are cut by the wire electrode as the machining progresses, to maintain sufficient flushing pressure in the chamber. In one embodiment, a chamber wall mamber is spaced from the workpiece by a gasket ring and flushing fluid is forced into the space between the two members, so that it is forced from there out from that space through the machining zone in the workpiece.

Abstract: The circuit is for driving motors in which there is access to all the ends of the motor winding sections. The circuit is of the type having a set of drive circuit units connected together as a gang in parallel between power source terminals. Each unit includes in series a winding section and a transistor control switch. There is additionally provided an auxiliary circuit with an auxiliary winding and resistor combination which substantially matches the motor winding and resistor combination impedance. The auxiliary winding is used to store the energy from a motor winding section when it is turned off and then to supply the energy to the next motor winding section to be turned on, thus reducing the driving energy needed for the motor and also reducing the current rise and fall times in the windings.

Abstract: To provide constant tension on an electro-erosive electrode machining wire, tape or ribbon stretched in a working path between advancing rollers and pulling rollers, a tension loading arrangement, for example weights, springs, or the like, are applied to the wire to maintain the tension thereof at a constant value. The deflection of the wire, due to elongation thereof as a result of heating, differences in manufacturing technologies and the like, is sensed and fed back to the motors driving the advancing and pulling rotors to maintain the tension, as controlled by the motor torques and speeds at a uniform value.

Abstract: The disclosed circuit is for controlling step motors of the type which have access only to a common winding neutral point or to partial neutral points. A switching transistor switches a low-loss circuit into the motor drive circuit for free running of the motor. A common circuit common to all the windings is switched in for rapid switching off of the current in the windings and for recovery of the energy stored in the inductors of the circuits.

Abstract: Disclosed is a system and method for controlling the motor drive for positioning a workpiece on a compound slide in such a way that the workpiece arrives at the target position in minimum elapsed time and without overshoot. A fixed program memory, in conjunction with a comparator and a combiner, is used to process information as to the actual position and velocity of the body and the desired position and velocity of the body to determine the optimum torque for the motor. The memory includes information as to the control characteristics of the motor and the desired path yet to be traveled to the target position.The method of positioning comprises the steps of controlling the motor so that it runs initially at maximum torque in a first region, at less than maximum torque and in the same direction in a second region, and then at yet another torque magnitude and with the torque in the opposite direction in a third region.

Abstract: A movement control apparatus, which can be constructed as an accessory, provides in addition to the primary process-controlled movement of the electrode circular a secondary movement. The secondary movement is imparted to the electrode through a drive arm fixed at one end to the bottom slide of a cross-slide on which the electrode is also fixed and attached pivotably at the other end to an eccentric point of a rotating spindle. The mechanism for rotating the spindle is so designed that the degree of eccentricity of the eccentric point may be adjusted mechanically while the spindle is rotating. The eccentricity may also be controlled by the action of a cam follower which runs along a template, so that the circular movement of the electrode is controlled by the template in a copying mode.

Abstract: A head assembly for an electro-erosion machine tool comprises, in a housing, a guide for guiding the moving filamentary or strip-form tool electrode and first contact means for supplying erosion energy to the electrode. The scavenging medium is fed into the housing so as to cool the contact means and guide, and leaves it by way of a nozzle through which also the electrode leaves the housing on its way to another head assembly arranged on the opposite side of the location where machining is performed, the scaverging medium being thereby fed to the machining location as an envelope coaxial to the electrode. Second contact means for contacting the workpiece to be machined are fixed to the nozzle and the connections to each contact means are arranged for low inductive energy loss.