Abstract: A series of input units (a machining attribute specification unit, a geometric element selection unit, and an additional information input unit) of a CAD/CAM apparatus according to the present invention enables machining attributes to be input in an interactive manner while such data are displayed on a display, simplifying input procedures of various items of machining attribute information, and enables the input various item information to be displayed on the display, making confirmation of the input information easy by virtue of the simplified inputting and by the visual confirmation.

Abstract: A CAD/CAM apparatus is adapted such that each set of machining process information representative of machining attributes and the relative machining path and the order of machining are stored in a storage portion associated with each geometric element of each shape of an object, and the machining process information can be modified according to the need and stored again by a machining process edition portion, whereby it is made possible to input information relative to specifications of machining methods in an interactive manner with the display screen.

Abstract: A curved surface forming system for forming a curved surface which is constituted by a plurality of curves and represented by two curved surface parameters, comprising an inputting unit for inputting the plurality of curves, a judging unit for determining a definition direction, a data storing unit for storing a direction data representing the definition direction, a curve consulting unit for consulting the curve in the opposite direction, and a curved surface forming unit for forming a curved surface.