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An engineering analysis of pipe bending along a circular copier with a deviation of flat material sections from the normal (by Love) position is performed, the dimensions of the active deformation area and the reactions of tools that generate friction forces are determined.

Proposed express-method of diagnosing of steering on articulated machine, which allows testing with a minimum expenditure of time and material resources. The proposed method is based on the method of partial accelerations. Carried out a normalization diagnostic index.