Microcomputer Control of a General Purpose NC Drill for Printed Circuit Boards

Abstract

The paper discusses the application of microcomputer in point-to-point positioning of an NC drill. A technique for minimization of the amount of programming required in a general purpose drill for printed circuit boards is the main concern. Active and passive electronic devices are categorized according to their types and pin connections. A subroutine is developed for each group of components and stored in the microcomputer permanent memory. Identification of the components and their initial positions are the only information required at the input of the microcomputer. A great reduction in programming efforts has been achieved and avoidance of the electromechanical tape readers has led to the elimination of much of their probable errors. The application can be regarded as an addition to the development facilities of electronic control research laboratory.