CAD APPLIED TO TWIST DRILLS

A computer aided design (CAD) modeller has been developed to facilitat e the design of twist drills. A feature of the system is its ability t o accept both the theoretical mathematical parameters used by drill th eorists and those parameters used as standard nomenclature in the dril l industry. Differences between the theoretical and 'real' drills are accounted for. The program presents a variety of views of the three-di mensional drill model and provides relevant numerical information. The CAD modeller is a platform for a greater computer aided engineering ( CAE) system, which is involved from the initial design stage through t o manufacture.