Abstract
The study presents the development of an automatic measurement system of machining errors of workpieces, on the same machine, without detaching them, and the evaluation of machining errors. A machined workpiece on a personal computer based DNC lathe is subjected to inspection by an electric micrometer mounted on the tool post in substitution for the cutting tool. To measure the deviation from the ideal dimension of workpieces automatically, the electric micrometer is moved along the surface of the workpiece by NC instructions for measurement in co-operation with the automatic programming system. Measured machining errors are compared with the thermal expansion of tool affecting the machining accuracy chiefly, and formulated as a function of cutting conditions.
