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Ball nose milling of complex surfaces is common in the die/mold and aerospace industries.Tool conditionmonitoring in ball nose milling of sculptured surfaces is complicated due to continuous changes in the cutting conditions.The present work aims to identify the milling tool conditions through the use of a force model that provides reference curing force given by the milling curer when it is sharp or new.The development of the force model involves the identification of the associated coefficients for the modeling of chip thickness for a given configuration of cutter and workpiece.The geometrical modeling for chip thickness is based on the curing of inclined surfaces and overlapping of previous passes using a ball nose milling curer.The average and maximum curing forces for various cutting conditions are used in this model as these parameters are more dominating from study of the cutting force data.The predicted force can be used to minimize the effects of varying curing conditions on the curing force data.The cutting force model is validated for various curing conditions.