A. Machining The major factors defining SSB during machining include the bending moment caused by imbalance of thermal residual stress diagram when the allowance is removed and surface loading caused by cutting action. The difference of these factors is as follows. In the first case internal forces are counterbalanced to external ones and are unambiguously defined by balance equations, while the deformation is uniform and collateral by section. In the second case the appearance of internal forces is connected with plastic deformation of a surface layer influenced by a tool when processing a workpiece. These forces cannot be reflected by balance equations, and deformation is non-uniform and does not coincide by section