The effects of cutter eccentricity on the cutting force in the ball-end finish milling

Ball-end mill are usually used for finish machining with multi-axis CNC milling centers. Cutter eccentricity (offset magnitude e c , angular location of the offset vector λ c ) is very important when predicting cutting forces accurately. In the process of cutting force modeling, not only the e c , but also the λ c , affects the cutting forces by associating with the rotation angle, the chip thickness, and the entry and exit angles of the cutting forces. The e c affects the values of the cutting forces, while λ c causes the delay phenomenon of the cutting forces mainly. Experiment results show that the cutting forces, considering the cutter eccentricity, more especially considering the influence of the λ c , agree better with the measured cutting forces than the cutting forces without considering the cutter eccentricity.