SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Parameters of Machining Accuracy and Surface Quality Machining accuracy is associated with a number of macro-geometrical parameters andflatness can be classified as follows 平直度,平面度 1. Machining accuracy of part sur faces roundness Accuracy of dimensions of part sur faces(for‖圆度,球度 example. accuracy of the diameters of cylindrical surfaces, accuracy of the diameters cylindricity of spherical surfaces, and accuracy of the圆柱度 angles at the top of the cones, etc.) Accuracy of shapes of part surfaces(for example, flatness of a plane, roundness, and cylindricity of a cylindrical sur face, etcSCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Parameters of Machining Accuracy and Surface Quality Machining accuracy is associated with a number of macro-geometrical parameters and can be classified as follows: l. Machining accuracy of part surfaces. - Accuracy of dimensions of part surfaces (for example, accuracy of the diameters of cylindrical surfaces, accuracy of the diameters of spherical surfaces, and accuracy of the angles at the top of the cones, etc.). - Accuracy of shapes of part surfaces (for example, flatness of a plane, roundness, and cylindricity of a cylindrical surface, etc.). flatness 平直度,平面度 roundness 圆度，球度 cylindricity 圆柱度