Abstract: Automatic start up of a continuous sine-wave commutated, brushless, direct current motor in a predetermined direction is done by applying a ramped armature current to the direct current motor to generate an armature field. The resulting armature field is rotated independent of angular position of the shaft. Upon rotation of the motor shaft beginning, the direction of rotation of the shaft is determined. Responsive to rotation of the shaft in an undesired direction, the direction of rotation of the armature field is reversed. A base angle of rotation of a shaft in the direct current motor is determined from an index mark as it rotates by an index mark detector. Responsive to detection of the index mark, rotation of the armature field and the angular position of the shaft are synchronized.

Abstract: A disk playback apparatus designed such that the linear velocity of the disk is stabilized during a short period corresponding to one to several revolutions of the disk and occurrence therein of vibration and noise is suppressed is disclosed. The apparatus is characterized in that the revolving axis of the turntable on which the disk is mounted is driven by a low-torque spindle motor and the wheel effect of the revolving axis or the spindle motor is made larger.

Abstract: A control unit enables tapping onto an end surface of a workpiece while rotating the workpiece. A workpiece rotational speed command (Vc) is applied from an NC unit (90) to first and second speed control circuits (111, 121) of first and second control circuits (110, 120), to operate these control circuits in a speed control mode, so that the workpiece (70) and a tapper (80) respectively mounted on first and second main spindles (10, 20) are caused to rotate at the same speed by first and second main spindle motors (11, 21).

Abstract: The present invention relates to a motor control device using an inverter or inverters, in particular, it relates to a motor control device suitable for the prevention of inertial rotation of a motor or motors or for the maintenance of synchronized operation of a plurality of motors in a service-interruption time; a DC side voltage is compared with a target voltage and a correction signal relating to the deviation voltage is added to a speed instruction for the inverter; thereby in a service-interruption time a motor can be continuously and smoothly decelerated keeping the DC side voltage of an inverter at a target voltage value. By utilizing a motor control device according to the present invention for a spinning machine etc., unevenness in thread winding or thread cut in a service interruption time can be prevented.

Abstract: A control device for a tool driving unit is disclosed wherein a tool such as a tap or a drill is controlled to be rotated and axially moved by the control device. The tool driving unit has a spindle servo motor adapted to be driven according to a spindle current command and a feed shaft servo motor adapted to be driven according to a feed shaft current command which are provided by a single microcomputer which operates as the control device. The microcomputer reads an NC program and outputs a spindle command for the spindle servo motor when performing tapping, and outputs both the spindle command and a first feed shaft command for the feed shaft servo motor when performing drilling. A thread pitch changing controller for controlling a thread pitch outputs a second feed shaft command for the feed shaft servo motor when performing tapping.

Abstract: An electronic thread tapper includes a cam-operated feed mechanism which drives the tap carriage rigidly in the advance direction only. Separate force means are employed to move the carriage in the retract direction when the tap is being withdrawn from the work material. Spindle and feed motors operate separately, but are cycle-coordinated during a dwell period between tapping strokes. By measuring any position error developed between the spindle and feed positions, a fault condition, such as a worn tap, a workpiece material defect, or an obstruction in the machine can be sensitively detected.

Abstract: The states of contact switches are switched when a mode switch is turned on. If the drilling operation is effected by means of a drill motor in this state, an oscillation signal which is repeatedly set to "H" and "L" in a preset period corresponding to an output of an oscillator is supplied to the control terminal of a firing pulse generator. The firing pulse generator interrupts supply of the control signal to the control terminal of a triac in the above preset period based on the oscillation signal supplied to the control terminal thereof to interrupt supply of an AC power source from a commercial AC power source to a bridge-type rectifier so as to intermittently drive a feed motor which is energized by an output of the rectifier in the above preset period. As a result, the drill motor can be intermittently fed towards a to-be-worked object by means of the feed motor, and, when the feeding operation is interrupted, a cutting operation can be instantaneously stopped and swarf can be cut apart.

Abstract: In a method for performing a synchronized superposed operation of two servomotors, controllers for the servomotors perform the control for achieving the synchronized superposed operation by: calculating, for each of the servomotors, the difference, or differences, between the ideal speed and/or position deviations obtained from a control command and the actual speed and/or position deviations obtained from the rotation of the servomotor; calculating a speed correction quantity, or a speed correction quantity and a current correction quantity, from the discrepancy, or discrepancies, between the differences calculated for both of the servomotors; and adding the correction quantity, or quantities, to a speed command, or to a speed command and a current command, given to the subsidiary shaft side. Thus, a synchronized superposed operation of servomotors in which speeds and responses of the main shaft and the subsidiary shaft are well balanced therebetween can be achieved.

Abstract: For controlling the rotation angle of a main shaft of a numerical control machine tool in synchronization with the position of a feed shaft, the learning control method according to the present invention comprises steps of reading the positional command value of the feed shaft corresponding to the detected value of the current revolutional angle of said main shaft out of the table which stores in advance the positional instruction values corresponding to the angle equivalent to one rotation of the shaft, subtracting the detected value of the current position of the feed shaft from the read out positional value to obtain the positional deviation table of the shaft, renewing the correction value table of the positional deviation values of the shaft which are stored in advance by using afore-mentioned deviation table, and suspending the renewal operation of the correction table of the positional deviation when the difference between the positional deviation table which has been added with the correction value ta

Abstract: When a spindle (10) of a machine tool is rotated and moved relative to a workpiece linearly along an axis (Z) thereof during a machining process such as screw cutting, a spindle servomotor (12) and a feed servomotor (22), each of which is the primary drive, must be rotated synchronously. In general, the spindle servomotor directly drives the spindle without a reduction gear, and the feed servomotor feeds a spindle head (18) through reduction gears (26, 28). Therefore, in general, the synchronous work is controlled in accordance with an acceleration and deceleration capacity of the spindle servomotor. Consequently, the spindle servomotor is rotated along the torque limit curve line (L1, L2) to drive the spindle, to thereby effect the synchronous work at a high efficiency.

Abstract: A numerical control apparatus is provided for controlling a position of a feed shaft in relation to a rotational angle of a main shaft of a machine tool. A value denoting the actual position of the feed shaft is subtracted from a positional command value to obtain a positional deviation value. The positional command value is one of a plurality of prestored values corresponding to a given rotational position of the main shaft. The positional deviation values for a single rotation of the main shaft are stored in a data table and displayed on a display device. Another data table having a plurality of correction values stored therein is provided. Each of the plurality of correction values stored in the correction value data table corresponds to a given rotational position of the main shaft. For each rotational position of the main shaft, the positional deviation value and a corresponding correction value are added together to obtain a corrected deviation value.

Abstract: Disclosed herein is a numerical control apparatus for controlling drive spindle heads in a rectangular coordinate system of machining apparatuses such as a lathe, a miller, a laser beam machining apparatus, an electric discharge machining apparatus, a robot and the like, to thereby perform positioning control.

Abstract: A thread cutting machine is provided with a control system in which, according to one aspect, the rotation of the spindle is controlled in the synchronous manner following up the feed amount of the spindle head and the rotation instruction is computed in accordance with the feed deviation, In another aspect, the feed of the spindle head is controlled in the synchronous manner following up the rotation of the spindle and the feed instruction is computed in accordance with the rotation deviation. In a further aspect, the rotation instruction is operated in accordance with the feed speed and the feed acceleration. In still a further aspect, the feed instruction is computed in accordance with the rotation speed and the rotation acceleration. In the preferred embodiments disclosed herein, the synchronism between the rotation of the spindle and the feed of the spindle head can be remarkably improved with various control modes, thus achieving the high speed thread cutting working with high accuracy.

Abstract: A motor control circuit for a machine, such as a granulator, having an intake adapted to receive parts to be machined. The motor control circuit detects the introduction of parts into the machine intake and automatically activates the motor for a predetermined period of time. Thereafter, the motor control circuit detects the presence of a machining operation through a vibration or sound transducer. In the absence of an output from the vibration or sound transducer, indicative that the machining operation has been completed, the motor control circuit deactivates the motor.

Abstract: A thread cutting machine where the rate of advance of the thread cutting tool is controlled by means of a control system whereby the rotation of the tool and its rate of advance toward the workpiece are both used to control the position of the cutting tool.

Abstract: A weft yarn feed device (1) comprises a measuring and storing drum (7) for storing a predetermined length of a weft yarn (4) thereon for picking operation, a rotary yarn guide (6) for winding the weft yarn (4) on the measuring and storing drum (7), a feed motor (8) for rotating the rotary yarn guide (6), a drive control unit (3) for controlling the operation of the feed motor (8), and a command control unit (2) which gives commands to the drive control unit (3). The length of the weft yarn (4) wound on the measuring and storing drum (7) is detected accurately on the basis of the relation between the number of rotation of the rotary yarn guide (6) and that of the crankshaft of the loom, and a detection signal indicating the length of the weft yarn (4) wound on the measuring and storing drum (7) is fed back to the command control unit (2) to control the feed motor ( 8) properly for winding a predetermined length of the weft yarn (4) on the measuring and storing drum.

Abstract: A method for realizing energy saving, for each of a plurality of mills provided in the hot rolling line, during the pause period until a successive work piece arrives a mill from a preceding work piece separates from a mill. The pause period is forecasted on the basis of a supply interval of work pieces supplied to the rolling line and a period of stay of work piece at each mill, and the mill is set in the pause state within the period defined by subtracting the preparation period required by the mill to reach the steady state from start of operation from such foreseen pause period.

Abstract: A high speed machining controller comprises an acoustic emission sensor which is installed in or near a machine for machining a work piece in a high speed and which detects acoustic emission generated during machining a work piece; a signal processing means which is composed of a band-pass filter for passing an element of a frequency band corresponding to the acoustic emission by inputting a signal outputted from the acoustic emission sensor, a rectification circuit for rectifying a signal outputted from said band-pass filter, a peak detection circuit for detecting peak values of the signal outputted from the rectification circuit, and a smoothing circuit for smoothing output signals of said peak detection circuit and for outputting a signal corresponding to the amplitude of the acoustic emission for the purpose of processing the output signal of the acoustic emission sensor to detect its amplitude; a cutting condition discrimination means for judging the cutting condition of a work piece by comparing a detec

Abstract: A line tracking control method of controlling a robot (51) to cooperate with a conveyor (50) in its movement determines a speed of movement of the conveyor (50) as a constant, determines a corrective variable (d) based on the determined conveyor speed, finds a boundary value (B) for the speed of the conveyor (50), compares the boundary value with an actual speed of the conveyor (50), and adding or subtracting the corrective variable (D) based on the result of comparison, thus determining a command value for the robot.

Abstract: A thread cutting machine where the rate of advance of the thread cutting tool is controlled by means of a control system whereby the rotation of the tool and its rate of advance toward the workpiece are both used to control the position of the cutting tool.

Abstract: The cabinet of the numerical control device contains a memory, a frequency changer, an amplifier and two correcting units. A programing station with keyboard and mounted on the cabinet enables programing the memory. The control device further comprises an encoder and a DC motor. It shall be associated with a lathe mechanically controlled by cams. The encoder records the successive positions of the camshaft and transmits these informations to the memory. In accordance with these informations the latter transmits mandatory instructions to the frequency changer and to the amplifier which modify the motor speeds and, consequently, those of the spindle and of the camshaft, to an extent dictated to the memory by the keyboard. At the beginning of particular machining steps the memory can activate the correcting units thus permitting to modify the instructions of the memory in order to find out the optimal speeds after some tests.

Abstract: A tapping machining method for moving a tapping tool to a commanded position in synchronism with rotation of a spindle, to subject a workpiece to threading, and thereafter rotating the spindle in the reverse direction and withdrawing the tapping tool from the workpiece in synchronism with rotation of the spindle. The steps of the tapping machining method include moving and positioning a spindle, namely the tapping tool (4), from an initial point (Pi) to an approach point (Pr) in the depth direction (along the Z axis) while being rotated at a constant velocity. Then a pulse distribution calculation is started by using the pitch of a screw and pulses of a frequency proportional to the rotational velocity of the spindle, and threading is performed while the tapping tool is moved toward a target position (Pe) by the distributed pulses.

Abstract: A control system for an impact printer having a cooling fan, in which a current for driving a printing device is detected as a voltage and the detected voltage is compared with a reference value. When the detected voltage is lower than the reference value, the current for driving the cooling fan is decreased.

Abstract: A control system for an automated jig grinder enables an operator to designate an incremental outfeed distance to be traversed for each outfeed operation and a reciprocation stroke count to be completed between successive outfeeds. The control system counts grinding tool reciprocation strokes and actuates an outfeed mechanism to outfeed the grinding tool the designated outfeed distance when the designated reciprocation stroke count has been reached. The incremental outfeed distance and reciprocation stroke count settings can be modified by the machine operator on a real time basis as the machine is running. The control system also enables the grinding tool to automatically travel from its upper position toward a workpiece at a first relatively high rate of speed, and then change to a slower rate of speed as the tool approaches the workpiece. This aspect of the invention is useful in wipe grinding.

Abstract: A datum is disclosed for use as a coordinate reference in a numerically controlled machine tool. The datum which is active, consists of an elongated member, typically one half wavelength in length, supported at its center (and antinode) by a plate, and including electromechanical transducers for exciting resonance in a desired fundamental longitudinal mode. The datum is operated by an operational amplifier having the transducers connected in the amplifier feedback path. Assurance against the excitation of undesired modes is achieved by limiting the gain of the operational amplifier throughout the response band of the transducers, by use of an inductor for resonating the input capacitance of the driving transducer at the frequency of the desired mode and by gain bandwidth limits of the operational amplifier. The datum is active at an ultrasonic frequency suited to touch sensing and thus produces a response in a touch sensing system when the cutter is touched to the datum.

Abstract: A control unit for model vehicles, such as model railway trains, model automobiles, etc. For independent operation of several model vehicles on a common electric circuit, it is known to allocate to each model vehicle a receiver coded in relation with hardware and controlled according to a binary word consisting of an address part and a data part. Control units of this type, however, have the disadvantage that they cannot be operated on analog electric circuits. With the invention, a control unit is proposed which independently switches off the digital control logic in the case of a change of the model vehicle from a digital trackage to an analog trackage, and enables operation of the model vehicle via an amplitude-controlled or pulse width-controlled analog signal.

Abstract: A numerically controlled motor provides a drive at a rate which is proportional to rotation of an independently driven shaft. In addition, the ratio of such rate to such rotation can be varied by a control circuit by which, in response to each pulse supplied by an encoder on said shaft, an incremental value, corresponding to an analogue signal supplied by a potentiometer to an A-D converter, which converts said signal to said value, is supplied to an accumulator, which sums the successively supplied increment values and, at a predetermined cumulative value, "overflows", such "overflow" supplying a drive signal to the n.c. motor. The potentiometer is manually set by an operator to vary the increment value and thus the frequency of "overflow" in relation to shaft rotation. The control circuit also enables "reverse" and "fast forward" drive to the motor independently of the shaft.

Abstract: A non-cutting tool or stylus (32), mounted in a position where a tool normally resides on a turret (26) of a numerically controlled machining system, rubs against the workpiece (41) as it rotates. The rubbing vibrations emanating from the workpiece (41) are picked up as a touch signal by an accelerometer (62) whose output signal is conditioned and fed to the numerical control (46). Diameter measurements, for example, are made directly by touching two opposing points on the workpiece (41) on opposite sides of the machine centerline (14) whereupon a difference calculation is made to provide the required diameter measurement.

Abstract: A material forming machine comprising a forming tool driven by a forming tool motor, a workpiece, a feed drive motor, a sensor, and a reference signal, wherein said sensor varies the speed of the feed drive motor by responding to variations of the speed of the forming tool's motion, and wherein the reference signal remains constant. Said machine performs sawing, shaping, milling, drilling, hammering, shearing, chiseling, and cutting on irregularly shaped workpieces, having variations in density.

Abstract: A numerically controlled machine tool comprises a tool movable into engagement with a workpiece, means for generating a first signal being a measure of the distance between the tool and a datum surface provided on a relatively fixed part of the machine, a first closed loop system adapted to move the tool toward the workpiece and having the first signal as feedback, means for generating a second signal being a measure of the distance between the tool and the workpiece, a second closed loop system (33) having the second signal as feedback, and means responsive to the second-mentioned distance attaining a threshold value, while being moved under the control of the first system, for changing control of the tool movement from the first to the second system.

Abstract: An automatic control system for machine tools having rotary tools is disclosed in which the tool drive motor load current, which is proportional to the mechanical load on said drive motor, is maintained at a selectable desired level by controlling the duration and phase of the power supplied to an alternating current feed motor which controls the distance between the rotary tool and the workpiece. A sensed load signal which is greater than the preselected level will cause the feed motor to move the tool away from the workpiece, while a load signal less than that desired will cause the feed motor to move the tool toward the workpiece.

Abstract: In a numerical control unit capable of driving a motor at a feed speed designated by a feed speed-designation dial, there are provided a potentiometer for generating a DC voltage proportional to the amount that a feed speed-designation knob is turned and an AD converter for converting the DC voltage output from the potentiometer into a digital quantity, the AD converter output being read out by a main processor section. The circuit construction can be markedly simplified as compared with the conventional circuit construction employing a voltage-controlled variable oscillator.

Abstract: A feed rate sensing system for a drilling machine or the like in which a linearly movable cutting tool-supporting block carries a rotatable tool spindle. Linear motion of the supporting block is converted to rotation of a screw and an encoder driven by the screw generates feed pulses representing feeding of the tool toward a workpiece. A proximity switch unit monitors rotation of the tool spindle and produces rotation pulses in relation thereto. A counter and latch circuit produces a digital output representing the feed rate of the tool-supporting block per revolution of the tool spindle and this digital output is converted to a voltage level representing the actual feed rate. A circuit compares such actual feed rate voltage with a desired feed rate voltage, the difference therebetween being applied to a meter.

Abstract: An apparatus for intermittently driving an endless belt by two electric motors in an automatic screen printing machine, which comprises a pair of rollers, an endless belt supported on the rollers, a direct current electric motor for intermittently driving said rollers and a control mechanism for setting a repeat length of the endless belt while converting it to a pulse number, detecting the actual feed length of the endless belt as a pulse number and subtracting the detected pulse number from the set pulse number to stop the endless belt at the repeat length corresponding to the set pulse number.

Abstract: In order to form concrete pipe of uniform density in apparatus where a packer head packs concrete into a mold to form the pipe, the horsepower of the drive motor driving the packer is sensed and used to adjust the rate of concrete supply such as to insure a constant horsepower as the packer is moved from one end of the pipe mold to the other.

Abstract: A motor drive control system for use in a machine tool having spindle and feed shaft motors. If the spindle motor, which is rotating at a constant speed during a machining operation, is subjected to an overload, and consequently experiences a drop in speed, this fact is detected by a detector for detecting the armature current of the spindle motor. The feed shaft motor is slowed down to a predetermined speed if the overloaded condition continues for a prescribed period of time. The feed shaft motor is stopped if an even greater armature current is detected to be flowing due to a continuing overload despite the fact that the feed shaft motor has been slowed to the predetermined speed.

Abstract: An electronic circuit measures the torque of a motor used to drive rotatable brushes, which may be used to clean the surfaces of flat articles, such as printed circuit boards. The circuit measures the torque by determining the average power consumed by the motor. The measured torque provides the operator of the system with an indication as to whether the brushes are spaced for proper impingement upon the article being scrubbed. The invention also comprises a servomechanism which provides for automatic and continuous readjustment of the position of the brushes, relative to the flat articles, in accordance with changing motor load conditions. The invention may be used to regulate the torque of a motor which is used in many other applications.

Abstract: Apparatus is provided for sensing a location on a commutator and, in response thereto, actuating a tool for performing an operation on the commutator. The apparatus includes a device for mounting the commutator for rotation so that it may be indexed to successive commutator bars which are to be worked on. There is also a light source and a device for directing light from the source to the surface of the commutator, and a device for directing the reflection of light from the commutator surface to a sensing device. When the light beam impinges on a non-reflective area of the commutator so that the sensing device is not actuated, the sensing device signals a control circuit for stopping the rotation of said commutator and for actuating a tool for performing an operation on the commutator. In order to prevent the interference of ambient light with the operation of the sensing apparatus, a protective housing is provided for at least partially enclosing the light-directing devices.

Abstract: In a nibbling machine having a fixed tool, a punching tool reciprocated by crank mechanism including a crankshaft and means for feeding a workpiece step-by-step between the fixed tool and the punching tool, feeding movement of the workpiece is controlled by a computer so that the workpiece is stopped while engaged by the punching tool but a maximum period of time is provided during which the workpiece can be moved. A pulse generator connected with the crankshaft generates 1000 to 20,000 pulses per revolution.

Abstract: A web fed press has at least one press unit including a first web driving means driven by a first motor. Downstream from the press unit is a second web driving means, such as nip rolls, driven by a second motor. Encoders are associated with the motors to produce pulse trains which are compared for motor speed relationship. If the relationship is not correct, the energization of the second motor is varied to correct the error. The relative web speed at the two locations is adjusted by effectively varying the number of pulses per revolution produced by the encoder for the second motor.

Abstract: A mineral mining machine having haulage drive mechanism and at least one cutter drive unit for cutting elements which may be at each end of the mining machine. The cutting elements are driven by an electric motor through a variable speed gear-train and the haulage mechanism is driven by a hydraulic motor through a gear-train. The invention provides for a torque sensing device associated with a part of each cutter drive mechanism to sense the power transmitted by the cutter gear-train and a power sensing device associated with the electric motor. The torque sensing devices are in the form of a mechanical or electrical transducer which provides a signal when the power transmitted by the cutter gear-trains exceed or tends to exceed the rated value of the cutter gears. The signal is transmitted to a hydraulic pump to control the output to the hydraulic motor and thereby effect reduction of the haulage speed.

Abstract: To initiate a scheduled speed change at the correct point in the operating cycle of a machine, a speed change command is subjected to a variable delay. Attaining the commanded speed level too early or too late in one cycle results in the speed change command being correspondingly delayed or advanced in the next cycle. In the preferred embodiment, a low point controller is designed to control the high-to-low speed transition in a multiple spindle bar or screw machine to achieve "feed" speed at the optimum point to decrease cycle time while avoiding damage to the cutting tools.

Abstract: In a tracer control system in which tracer head control is switched over from a quick feed mode to a deceleration mode of operation to alleviate a shock when the stylus of the tracer head contacts the model, the amount of change in the configuration of the model at a profiling start point is detected to control the point of switching over the quick feed mode to the deceleration mode of operation for the next profiling start point in accordance with the detected value, thereby to ensure that the above mentioned mode switching is always accomplished at substantially a constant position relative to the profiling start point on the model surface so as to shorten the profiling time.

Abstract: A processing system for delinting cotton has a delinter driven by an AC drive motor. The delinter is fed by a feeder/cleaner driven by a DC feed motor. A visual display ammeter measures the current drawn by the drive motor and produces a given load voltage corresponding to the measured current. The load voltage is then translated into a feed voltage to the feed motor, thereby regulating the feed into the delinter at a predetermined rate responsive to the load on the drive motor.

Abstract: A method and apparatus are disclosed for controlling a machine tool as a function of the torque load on a cutting tool. The apparatus detects the spindle motor current which may vary over four decades, the spindle motor voltage which may vary over two decades and the cutting tool angular velocity which may vary over three decades. The decimal values of the detected variables are converted to corresponding logarithmic values and stored in digital form. A microprocessor utilizes the stored values to calculate the value of torque on the cutting tool which may vary over five decades. A microprocessor determines the idle torque by averaging the torque which is measured several times over one spindle revolution. The idle torque is subtracted from subsequent gross torque measurements to provide an indication of actual cutting load on the tool. The operation of the machine is modified in response to the actual torque exceeding a predetermined reference torque value.

Abstract: Disclosed is a stepping motor control utilizing a microprocessor. The control is suitable for driving one or more stepping motors one at a time or in unison. In the illustrated embodiment when plural motors are driven together they are driven at the same rate or at rates in a fixed proportion to one another although several of the features of the invention are suitable for use in circuits providing contouring control; i.e., where separate motors are driven at separate stepping rates proportional to the relative distances each is to traverse for a single movement. An acceleration/deceleration circuit is utilized which provides simple yet highly accurate and efficient control of the stepping motors. Feed rate compensation for simultaneous drive of two motors is provided. Also a means is provided to allow stepping rates in excess of the counting rate capability of the microprocessor.

Abstract: A blank feeding apparatus for feeding blanks one after another from a stack of blanks to the next processing rolls. Blanks are pushed by kickers attached to an endless conveyor. The motor for driving the conveyor is electronically controlled so that one cycle of kicker operation will be completed while the processing rolls make a full rotation, said one cycle including the acceleration tuned-run and deceleration steps.

Abstract: A rotary table is driven by a pair of perpendicularly disposed linear slides which are each driven by a ballscrew drive. One of the linear slides is mounted on the movable member of the other linear slide and is coupled to the rotary table by a crank stud. The linear slides are driven at speeds which vary in accordance with the sine and cosine of the table angle to translate the linear slide motion into rotary motion.

Abstract: The invention relates to an attachment for the machining by stock removal of parts to be turned, particularly such which have surface longitudinal profiles which differ from the exact circular shape and may furthermore be irregular, with the aid of a tool whose in-feed movements are brought about by an electrically contolled servo-motor, whose follow-up time is very short, so that the tool nose can follow the pattern of the desired non-circular shapes without any limitation of the cutting speed which are usual in turning.

Abstract: A machine with automatic feed speed control comprising, a work-piece advancing device for advancing a work-piece in a feed path at a feed speed, a work-piece tooling device having a tool member movable in the feed path with a portion engageably with the work-piece for tooling the work-piece and for receiving a load from the advancing work-piece through the action of the work-piece advancing device. The load is proportional to the size of the portion of the tool member engaged with the work-piece. A speed controller is connected to the work-piece advancing device for increasing and decreasing the speed thereof and thereby increasing and decreasing the feed speed of the work-piece. Work-piece sensors are provided in the feed path engageably with the work-piece for sensing the size of the portion of the tool member which will become engaged with the work-piece, which size corresponds to a maximum load on the work-piece tooling device.