Abstract: Described is a coating composition for the formation of a back coat layer in a magnetic recording medium, which comprises carbon black, a binder and a solvent. The binder is composed of an acrylic-polymer-modified polyurethane resin and a vinyl chloride copolymer having at least one type of terminal groups selected from hydroxyl groups, carboxyl groups or tertiary amino groups.

Abstract: A method for defining machining areas of a workpiece by means of a CRT screen display in an interactive system for creating a program for NC machining includes the steps of providing a first display of a workpiece before machining including a designated area to be machined, providing a second display identifying a first area to be machined and, after programming a first machining operation, providing a third display representing overlapped views of the first and second displays so that uncut areas of the workpiece requiring further machining operations can easily be identified. A check is made by comparing previous displays to assure that identified uncut areas exist, and candidate tools are shown in the display to provide easy selection.

Abstract: An interactive type automatic programming method which facilitates the detection of errors in a part program and permits only a required portion of the modified/edited part program to be re-executed. First, part program statements are displayed on a screen, and every time the operator inputs a one statement execution command (S4) a programming system executes one program statement and displays the result of the execution on the screen (S6, S7). When an executed part program statement is found to be erroneous, the operator inputs a modification command (S5), moves the cursor to specify the program statement to be modified, inputs a program modification command (S13, S15), and then corrects the program statement. In response to an operator's input of a re-execution command (S18), the programming system re-executes only a required portion of the part program beginning with the modified part program statement and ending with a part program statement to be executed next (S19).

Abstract: Any hole shape pattern (HPT) and a machining procedure thereof are specified in dialog fashion and these are registered in a hole-type file (FLD) as a single item of hole-type data. In a case where the registered hole type is designated by a keyboard (14) in the creation of NC data for hole machining, an automatic programming unit (11) causes a dialog screen conforming to the hole type to be displayed on a CRT (13). Hole shape dimensions and tools used in each machining process are specified, and NC data for hole machining is created based on this data.

Abstract: A prompt (MEQ) which indicates whether a machining end-point is (i) a point which coincides with a machining starting point, (ii) a point a predetermined amount .DELTA..alpha. past the machining starting point, or (iii) a point a predetermined amount .DELTA..alpha. short of the machining starting point is included on a dialog screen (DIM) and machining end-point information is entered from a keyboard (12). In response, a processor (11a) of a system main body (11) automatically computes coordinates of the machining from the machining end-point information, the machining starting point and path data, and creates NC data for arriving at the machining end-point along a path specified by the path data.

Abstract: An NC data execution method which permits an efficient checking of the validity/invalidity of NC data through a simple operation. In an NC data execution process, a processor of an automatic programming apparatus reads out NC data, block by block, from a memory (S2), and determines whether or not the read NC data block satisfies an NC data execution interrupt condition, e.g., whether or not the data block contains a specific code (S3). When the interrupt condition is fulfilled, the data block is displayed at an input display field on the screen (S4), and then the NC data execution, including a graphic display operation based on the content of the data block satisfying the interrupt condition, e.g., a display of a tool path and the reading and display of the next block, is automatically interrupted, whereby the operator is allowed to thoroughly check the data block satisfying the interrupt condition.

Abstract: A figure definition method including the steps of displaying a list (11) of the definition statements of already defined figure elements and graphic images (12) of the already defined figures on a display screen; successively displaying, one at a time in a form distinguishable from others, figure definition statements (11a, 11b, 11c . . . ) in the list (11), as well as the corresponding graphic images (12a, 12b, 12c . . . ), whenever a first element selection key (13a) is operated to select a first figure element; then successively displaying, one at a time in a form distinguishable from others, figure definition statements in the list (11), as well as the corresponding graphic images, whenever a second element selection key (13b) is operated, to select a second figure element; and defining another figure element using the selected first and second figure elements.

Abstract: In an automatic programming apparatus involving NC program data for wire-cut electric discharge machining according to the invention, data specifying an approach path and a departure path, as well as wire-cut machining conditions, are registered in advance. In automatic programming, rather than entering an approach path, departure path and machining conditions separately, only machining profiles (51, 52, . . . ) are successively defined, after which the machining profile data and the registered data are used to originate, for each and every machining profile (51, 52, . . . ), (i) approach NC data, (ii) NC data for moving a wire electrode along the machining profiles (51, 52, . . . ), and (iii) departure NC data.

Abstract: A method of creating NC data including storing various approach/withdrawal patterns in dependence upon a particular zone in which a turret index point/tool exchange position (P.sub.T) is present, the zone being one among zones (ZN.sub.1 -ZN.sub.3) defined by horizonal and vertical axes passing through a point (Q) specified by a safe position coordinate (Z.sub.S) in a longitudinal direction of a workpiece (WK) and a safe position coordinate (X.sub.S) in a direction perpendicular to the longitudinal direction, and in dependence upon a plane to which a cutting starting/end point (P.sub.S) belongs, the plane being one of a plane (LPS) in the longitudinal direction of the workpiece and a plane (TPS) perpendicular to the longitudinal direction belongs. A predetermined pattern is selected from among the stored approach/withdrawal patterns based on the zone to which the turret index point (P.sub.T) actually belongs and the plane to which the cutting starting/end point (P.sub.S) actually belongs.

Abstract: A method of diagnosing the deterioration of a zinc oxide type lighting arrester having one or more series-connected non-linear resistance elements including steps of elimination of the effects of capacitive currents from phase currents; obtaining a synthesized waveform using a window type transformer based on the resistance elements alone; and diagnosing the presence of a deteriorated non-linear resistance element by generating a first pulse voltage when the maximum crest value of the synthesized waveforms exceeds a predetermined value, generating a second pulse voltage representative of terminal voltage of the resistance element, and calculating the difference between the first and second pulse voltages.