The manufacturing of free form surfaces is a common task in the field of mould and
die manufacturing. The changing circumstances of the finishing milling with ball-end
milling cutter has effect on the shape and the volume of the chip, the load of the
cutting tool and the generated surface roughness. The aim of the article is to investigate
the changing of the chip thickness and volume in case of ball-end milling by 3D CAD
modelling, and to analyse the changing of the circumstances in case of milling of
a convex and a concave surfaces.