Abstract
This paper describes machining errors in high-speed ball end milling of cylindrical surfaces. The machining errors resulting from tool deflections are calculated at various parts of the machined surface and they are examined in experiments. The workpiece used is cold working tool steel and its hardness is HRC60. Cemented carbide ball end mills coated with (Ti, Al)N are used. It became clear in this research that 1) the machining error decreases with milling position angle, 2) up cut mode generally yields higher accuracy than down cut mode, and 3) in up cut mode, the machining error is larger at the upper part of the machined surface than at the lower part, and the converse is true in down cut mode.
