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Many products are designed with surface textures that enhance the aesthetic  and tactile qualities of the product. In this paper, a curved-surface,  patch-division milling technique is proposed for creating uniform aligned  cutter marks on a curved surface. Previous research demonstrated a ball-end  milling technique that divides the surface into small planar patches where  each patch is generated by a helical tool path with dimples in uniform  alignment. Because the patches are planar, it is impossible to precisely  machine a concave or convex surface. However, the technique could only  approximate a method for machining curved surfaces. To resolve this issue,  curved surface patches were developed to generate the patch directly  according to the shape of the targeted curved surface. The dimples are  expected to be uniformly aligned on curvedsurface patches. Therefore, the  targeted surface should be cut using an appropriate machining condition.  According to the test results, the distribution of dimples was the same as  the pre-determined distribution. In addition, the dimples were regularly  aligned when viewed from a specific angle. This proposed method overcomes  the deviation of the dimple's positions, which is caused by the  acceleration--deceleration of the machine tool and the change of the cutting  point during five-axis machining.

Generation of Uniformly Aligned Dimples on a Curved Surface Using a Curved-Surface, Patch-Division Milling Technique