In the present paper results about simulation of surface topography in side milling with cylindrical milling tool are presented. Different values for grinding errors of tool radii and for eccentricity were taken into account. In addition, different helix angles were considered. When grinding errors increase, effective radius of some cutting teeth increases. This tends to reduce the number of machining marks per tool revolution. Eccentricity produces a similar effect. Provided that the tool has eccentricity and helix angle, different profiles will be obtained at different workpiece’s heights. If eccentricity is high enough, roughness heterogeneity bands are found at different heights on the workpiece’s surface. In the roughness bands the number of cutting teeth marks per revolution is higher than in other areas. The higher helix angle the narrower width of heterogeneity bands. However, maximum and minimum roughness values along the workpiece’s height are the same, regardless of helix angle.