Automatic Dimension Measurement on CNC Lathes Using the Cutting Tool

In the paper the possibilities of measuring the dimensions of parts using the cutting tool that had machined the surfaces of the part are investigated. Described are the principal scheme of the measuring device and its application for dimensional measurements. The method leads to more efficient machining on CNC lathes. The application of the method results in automatic dimensional control, which otherwise would require specialised measuring equipment or would lead to increased idle time of the machine tool, automatic dynamic setup of the cutting tool, and automatic tolerance assurance using check-up datum surfaces. Reported are the theoretical analysis of the measurement errors and the method of predicting the accuracy of the measurements using the cutting tool itself. Presented are experimental results of applying the system for direct dimensional measurements using the cutting tool on CNC lathes.