Abstract: The system is applied to a lathe and allows control of the machine to be adapted in such manner as to make use of the maximum power of the spindle motor with the maximum feed of the tool and the minimum cutting speed. The feed rate and the cutting speed are defined by the programmer only as the permitted region within which these parameters must jointly lie. The control unit tends constantly to command the feed rate and the spindle motor in such manner as to be within this region. Then the control unit compares the power consumed by the spindle motor, which is detected by a circuit through the armature current, with the maximum power of the motor for the actual working conditions and tends to cause the feed rate and the number of revolutions to be adapted in such manner as to make use of this maximum power. The system is adapted to exclude adaptation during cutting-in-air operation.

Abstract: For each axis, a cyclic transducer has a scale supplied with a sinusoidal signal from a timing unit and a cursor which provides two output signals which are proportional to the sine and to the cosine, within the elementary interval of the transducer. Sin .alpha. and cos .alpha. and the corresponding inverted signals are supplied to squaring circuits and logic which generates a three-bit number in a register defining the octant (000 to 111, i.e. 0 to 7) within which the electric angle .alpha. lies. The three-bit number controls multiplexers each having inputs for quadrants 0 to 7 and feeding respective sample and hold circuits and whose signals are NUM and DEN. An analog-to-digital converter system forms the digital value n=NUM/DEN and n along with the lowest order octant bit address a ROM which outputs the value of .alpha. within the range of a quadrant. A microprocessor responds to the higher two bits to create the final value of .alpha..

Abstract: A numerical control system for machining centers, having a RAM and two groups of peripheral units, comprises two proessors interconnected by means of a common signal bus and adapted to operate simultaneously sharing access automatically to the RAM and to the peripheral units.One of the two processors is specialized for executing the computations relating to the interpolation of the path of the center of the tool with respect to the workpiece to be machined, while the second processor is specialized in control of the said peripherals. One group of peripherals comprises input and output means for data and programs and another group comprises a series of units for measuring and controlling the movement of the said tool and the said workpiece. The said processors are connected to the said memory and to the said input and output means by means of one signal bus, the measuring and control units are interconnected by means of a second signal bus connected to the first bus through a bidirectional interface.

Abstract: Numerical control apparatus for a lathe which reads from an input medium data specifying the transverse and axial position of the cutting edge of a lathe tool with respect to the axis of the workpiece being machined, the cutting rate for the tool, and the rate of advance of the tool. The apparatus includes processing means responsive to the data for generating a continuous transverse position datum for the tool and computing means controlled by the cutting rate datum and the continuous transverse position datum for controlling the rotational speed of the mandrel of the lathe.

Abstract: An electroerosion apparatus utilizing a wire electrode supported at opposite sides of a workpiece is adapted to cut a given profile in the workpiece with a rake by shifting the electrode supports and thereby inclining the electrode with respect to the cutting plane. The electrode supports are at the end of two arms which can move in coordinate axes in conjunction with the movement of the workpiece table to define the profile by means of orthogonal coordinate control.

Abstract: Numerical control means for controlling the position of a machine tool or the like by means of a servomotor are described. A position command signal is compared to the signal indicative of the servomotor position, and the resultant error signal is added to a speed command signal to control the speed of operation of the motor. A follow-up signal is generated whenever the amplitude of the error signal exceeds a predetermined level, and the latter is added to a digital position signal coupled to the system. A constant digital signal generated by said follow up signal is added to said error signal instead of said speed signal.