Scientific paper ID 1072 : 2014/3

The term section used here is defined as well as the way to division of exem-plary rotationally-symmetric part surfaces to sections. The way to fill in the input data form with data describing part surfaces of each section according to the accepted rules is explained. Data are grouped together according to section type: cylindrical, conical, circular and threaded. Dimensions and tolerances of each section surface written on the drawing and sufficient for full description of section geometry are written into the input data form. Data as accuracy grade roughness tolerances of form orientation location and run-out in relation to datum surface also can be filled in the corresponding section of the input data form. Tolerances (tolerance grade 12 or higher) are added to each size without tolerance indication. Software for uninterrupted and consistent processing of part geometric data is developed for avoiding of its intermediate input. Longitudinal dimensions are recalculated to a common datum – coordinate system origin which is fixed at the right hand side part face. If there is need to turn the part positioning for its full processing longitudinal dimensions are recalculated again to a common datum – coordinate system origin which is fixed at the right end of the turned part. Tolerances of the initial longitudinal dimensions to the left end of each section remain unchanged that is just the same values that are written on the drawing. Tolerances of longitudinal, diametrical and radial dimensions written on the drawing together with tolerances added to sizes without tolerance indication form continuous tolerance zone along part contour.