Abstract
This paper deals with cutting mechanism at inside corner by a square end mill. The results are as follows. (1) Cutting mechanism of corner cut by end mill is analysed geometrically. And calculating procedures of actual radial depth of cut and cutting area are shown at inside corner. (2) New cutting method is presented that commands a looped cutter path during corner cut. The method suppresses rapid increase of radial depth of cut and cutting area. (3) Optimum diameter of end mill and loop radius of cutter path are calculated. Under the cutting condition, these values are 17 mm and 1.5 mm respectively. (4) It is shown by cutting tests that working accuracy is improved remarkably by the new method at inside corner.
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