308806 Lecture Notes - Lecture 3: Machine Tool Builder, Cartesian Coordinate System, Limit Switch
21 Jan 2017
School
Department
Course
Professor
Document Summary
Cnc (computer numerical control): form of nc system whose machine control unit (mcu) is based on dedicated microcomputer rather than a hardwires controller. Nc (numerical control): form of programmable automation in which the process is controlled by numbers, letters and symbols. Parts are processed frequently and in small lot sizes. Many operations must be performed on the part in its processing. Expensive part where mistakes in processing are costly. Reduced non-productive time which results in shorter cycle times. Axis: any direction of motion that is totally controlled by specific commands. X-axis normally parallel to longest dimension of primary machine table. Y-axis normally parallel to shortest dimension of primary machine table. A, b, c designation angular motions around x, y, z axes respectively. In case of a turning centre these movements are identical to movement in relation to the work. On machining centres, where is it the table and not the cutting tool which moves, this is not the case.
