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the increase of the dynamic and static stiffness of a . the dynamic stiffness of a grinding machine influences the process stability enormously.

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an accurate cutting force model of ball end milling is essential for precision prediction and compensation of tool deflection that dominantly determines the dimensional accuracy of the machined surface. this paper presents an improved theoretical dynamic cutting force model for ball end milling. the

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normal stiffness (k n), shear stiffness (k s) and friction coefficient (μ) for the mill shell and balls should be used in numerical modeling. these parameters should be validated with experimental observation. for this purpose, a transparent laboratory ball mill was made from the plexiglas shell and rubber liner and lifters. the balls were made of compressed glass. the transparent ball mill

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