Abstract: A numerical control apparatus for independently controlling the rotational velocity of a plurality of spindles. One or more spindles and one spindle rotational velocity are designated by NC data outputted by an NC data generating unit (1), the data in memories (3a-3n) corresponding to spindles designated by switching unit (2) is updated by the designated spindle rotational velocity, and motors (6a-6n) of corresponding spindles are controlled to rotate at the spindle rotational velocities stored in the memories (3a-3n).

Abstract: A high speed machining system for machining a curve while interpolating pulses at a high speed is disclosed, wherein data of a curve (1a) to be machined by instructions from a custom macro (1b) is divided into data representing fine amounts of movement by a user through a custom macro instruction means (2) and stored in a memory (3) as machining data before machining. The data representing fine amounts of movement is pulse interpolated by a pulse interpolator (4) for machining, whereby a cam curve and the like can be machined a high speed without the need for an automatic program creation unit and the like.

Abstract: A high-precision pulse interpolation method for interpolating the amount of movement of individual axes of a numerical control apparatus (1) with high precision. An interpolation pulse is output twice or more in one task and is written into a shared RAM (2). A servo control circuit (3) outputs the interpolation pulses in the shared RAM at regular intervals, to control a servometer (5) with a high-precision pulse interpolation.

Abstract: Disclosed is a tapping control system capable of performing tapping work with high accuracy and reliability in a manner such that rotation of a tap by means of a digital spindle motor (1) is synchronized with axial drive of the tap by means of a servomotor (2).A digital control circuit (5), used to drive the spindle motor, is supplied with a speed command from position control means (4). The speed command is based on a distributed pulse from an interpolating circuit (3a) for linear interpolation in accordance with the pitch value of a screw to be worked, and a feedback signal indicative of the rotational position of the spindle motor. Also, a servo-circuit (12) for the servomotor is supplied with a distributed pulse from the interpolating circuit. Thus, the two motors are driven synchronously.According to an aspect of the present invention, the tapping work is performed in a fixed cycle such that forward and reverse rotations of the two motors are repeated to reciprocate the tap.

Abstract: Execution format data required by a specific C-axis machining function such as a lead machining function are prepared by a custom macro, which has been stored in a ROM (102), based on data set by an operator through use of setting means such as a keyboard (104), and high-speed distribution data for controlling the machine tool are provided whenever necessary by setting parameters similar to those in ordinary milling. This makes it possible to realize a specific machining function which requires high-speed interpolation for machine movement command data.

Abstract: A numerical control program in the form of a high-level language on a paper tape (14) is converted in its entirety to a machine language by using a compiler stored in a compiler cassette (19). The converter program is then stored in a RAM area (12) of a numerical control system (numerical control program storage area), and thereafter written as the machine language into a new ROM cassette (18) by writing means such as a ROM writer (17). The ROM cassette (18) is detachable from the numerical control system and can be carried away. For executing a numerical control process, the ROM cassette (18) is attached to the numerical control system, and the numerical control program stored as the machine language in the ROM cassette (18) is transferred to the numerical control system, after which the numerical control program is executed.

Abstract: A numerical control method makes it possible to perform machining of a workpiece at a high speed with a desired accuracy. After start of pulse distribution, a determination is made as to whether or not both a block being executed and a next block of an NC program relate to a cutting command (steps S12 and S13). An in-position value (A, B), corresponding to the determination result, is then stored in a register (C). In the case of three control axes, when the deviations (.epsilon.x, .epsilon.y, .epsilon.z) between target moving amounts and actual moving amounts for the three control axes are less than the value stored in the register (C), positioning control for the present block is completed, and the execution for the next block is started (S10). This permits variable setting of the desired positioning accuracy to be carried out. The method is applicable for any number of control axes.

Abstract: An interfacing method in a numerical control apparatus is provided, which is capable of effecting, at a high speed, an interfacing process upon transfer of a signal between microprocessors respectively housed in a numerical control section and in a programmable machine controller. When reading out an M code from a numerical control program, the processor of the numerical control section delivers the M code to a latch circuit of an interface circuit so as to store the same code in the latch circuit, and inverts a logic level of a first status signal (MF) stored in a corresponding bit region of a first register of the interface circuit. Thereafter, when the controller completes a sequence control associated with the M code, the processor of the controller inverts a logic level of a second status signal (MFIN) stored in a corresponding bit region of a second register of the interface circuit.

Abstract: A tool profile automatic graphic display system according to the invention includes memory means (6) for storing a conversational-type machining program and a tooling file used as tool data, data input means (3) for inputting machining data, control means (1) for selecting an optimum tool in dependence upon specified machining data relating to a machining region and machined profile of a workpiece, and graphic display means (4) for graphically displaying the profile of a selected tool, the graphic display means (4) graphically displaying a tool profile along with a blank profile and machined profile automatically.

Abstract: This invention relates to a commanded position restoration method in a numerical control system comprising an NC unit (11) having a path control function and machine position correction function, a motor (15) rotated on the basis of a command from the NC unit for driving a movable machine element, a pulse coder (16a) which rotates in synchronization with rotation of the motor and which generates a pulse whenever it rotates through a prescribed angle, and a counter (16b) which counts the pulses in dependence upon the direction of rotation for storing the machine position, which counter stores the machine position even if power is cut off.In the commanded position restoration method, a counted value C.sub.RA in the counter (16b) at the time of reference point return is set beforehand in a memory (11c) backed up by a battery. Whenever power is introduced to the system, a counted value C.sub.

Abstract: The present invention provides a method of editing NC programs for a four-axis lathe for creating NC programs that make possible simultaneous machinining by two tool rests. In order to raise machining efficiency, the machining speed is adjusted between the NC programs edited for each tool rest or an adjustment is performed by altering machining sequences or by resetting them in such a manner that the machining sequences are executed simultaneously. This facilitates modification of machining speed, resetting of machining sequence, etc.

Abstract: A trajectory display system displays a still picture, which includes a machining region, and a trajectory by making a color designation in the form of a black base picture background color (a) and a three-color bit pattern R (red), G (green) and B (blue). A display color (e) of the still picture and the display color (e) of the machining region are designated in a relationship where the colors are mutually complementary. The display color of the still picture superimposed on the machining region is made to appear black, which is identical with the background color designated to be black, and the display color of the trajectory and the display color of the machining region are displayed in the same color.