METHOD AND APPARATUS FOR SETTING COORDINATE SYSTEM ORIGIN

摘要

A figure on a drawing DR placed on the read-out area TRA of a tablet is entered through a coordinate designating device by designating a plurality of points on the drawing, and at the same time the origin of the drawing coordinate system is set and entered. To carry out the setting and entry of the coordinate system origin, a first point Pt on the drawing is designated by the coordinate designating device to enter the coordinates of the first point Pt in a tablet coordinate system, and the coordinates of the designated first point Pt in a numerical control data coordinate system are entered by a keyboard or the like to set the origin of the numerical control data coordinate system. The invention provides a method and apparatus for effecting the foregoing setting of the coordinate system origin. The origin of the numerical control data coordinate system can be easily established, and can be set and entered even when the origin is located outside tne read-out area TRA of the tablet.