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CAM software with a re-machining feature can create tool paths for removing just what stock remains after high-feed-rate moves have rounded off internal corners.
Rest milling (to machine the "rest" of the material) is a term for re-machining. Rest milling generally employs multiple passes. When just one pass is used to let a small tool trace the seam where two surfaces meet, this is called pencil tracing.
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Media Player: 56k | 100K
Re-machining video courtesy UGS.
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