Abstract: Concise algorithm is presented to obtain gouge-free tool-path with projection strategy. Interference check and correction are regarded as calculation of directed distance between cutter's surface and part surface (s). According to sign (positive or negative) and value of directed distance, interference was detected and corrected. With advantage of revolved surface, cutter's surface can discrete easily. Using coherence between adjoining points and tracing method, interference depth and position are obtained with significant computational savings.

Key words: Check, Interference, Machining, NC, Projection