Thus, of the workpiece during heat up significantly. Their deformation (error) depend on the size and weight, the coefficients of linear expansion.
Small workpieces are very rapidly reach temperature equilibrium. Procurement of a large mass during the treatment process may never reach a stationary regime and then the temperature factor is manifested to a greater extent (especially in draft modes). This implies that finishing should not be performed after roughing (justification of the principle of superposition etc.).