Abstract
Dies with high accuracy in shape is difficult to be machined with a small diameter end-mill, since the end-mill deflects on a large scale at a cutting point due to cutting forces. In this research, relationship between machining errors and cutting forces in sideway cutting with a small diameter end-mill is investigated experimentally in order to estimate the deflection of end-mill at a cutting point by using measured cutting forces. As a result, it was concluded that machining errors could be estimated from thrust forces at the moment when the cutting point without deflection of an end-mill exceeds slightly from the cutting point closest to finished surface during its rotation.
