NC Machining of Freeform Pockets with Arbitrary Wall Geometry Using a Grid-Based Navigation Approach |
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Authors: | R Narayanaswami Y Choi |
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Affiliation: | (1) Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA, USA, US |
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Abstract: | 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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Keywords: | :B-splines End-milling Interpolation NC machining Pocketing Tool path |
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