LAUSR

This paper presents a method to generate toolpaths for continuous B-Axis turning operations. Modern CNC turning centres allow continuous tool rotation about the B-Axis during operation; a suitably programmed tool orientation allows it to remove more material in a single setup. Given the tool and part profile shapes as chains of arcs and lines in 2D, the method facets the nose-radius offset of the part profile taken as the initial toolpath, and computes a gougeand collision-free tool angle in each facet taking an initial angle. This initial angle is suggested by a strategy of tool movement, such as being normal to the toolpath. Contiguous facets with infeasible tool angles are identified. A process of “covering” them with newly constructed convex segments is applied to modify the toolpath. The steps of toolangle computation and convex-covering are repeatedly applied till all infeasible segments are eliminated. Parameters including rotation limits, clearance angles and distances are incorporated when determining angles. The method is demonstrated with holder, insert and part shapes drawn from constructed and real-world examples. The method is simple to implement and draws on increased speeds available in current multi-core processors. Future work includes exploration of other tool movement strategies for optimized angles, checking properties, e.g., surface finish, and extension to roughing operations.