A tool path must be determined in an efficient manner to generate NC (numerical control) code for machining. This is particularly important when machining freeform pockets with arbitrary wall geometry on a three-axis CNC machine. In this paper, a grid-based 3D navigation algorithm for generating NC tool-path data for both linear interpolation and a combination of linear and circular interpolation is presented for three-axis CNC milling of general pockets with sculptured bottom surfaces. The pocket surface is discretised by defining a grid and the navigation algorithm plans the tool motion. The grid size and the cutter diameter are chosen so that a predefined tolerance for surface roughness is satisfied. The grid-based navigation algorithm is simulated graphically and verified experimentally.
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Narayanaswami, R., Choi, Y. NC Machining of Freeform Pockets with Arbitrary Wall Geometry Using a Grid-Based Navigation Approach. Int J Adv Manuf Technol 18, 708–716 (2001). https://doi.org/10.1007/s001700170013
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DOI: https://doi.org/10.1007/s001700170013