Contemporary CNC systems (CNCSs) for metal-cutting machine tools must meet increasingly stringent requirements for machining throughput and quality. Machine tool throughput is primarily determined by the contouring speed V, which can reach several meters per minute in finishing operations. The feed drives must support such speeds with sufficient dynamism. This due to the fact that, when a tool is moving along a curved path at given speed, the velocity components for individual coordinates are nonuniform and abrupt feed drive speedups and slowdowns are possible. These motion features must be taken into account either in the control programs (CPs) or directly in the CNCS. In both instances, motion must be planned so that its components paralleling the coordinate axes are consistent with the specified speed and acceleration constraints.
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