Abstract
This paper presents a newly developed in-process workpiece dimensional measurement and error compensation technique for NC lathes. During operation, the diameter of the workpiece at the cutting point can be obtained through three servo measurement units. Each unit is composed of a non-contact proximitor for direct gap sensing, a stepping motor controlled linear carriage to move the proximitor for surface tracing, and a LVDT for position feedback of the carriage. The error compensation strategy is implemented by interrupting a compensator in the position feedback loop of the NC servo system so that the tool position can be directly controlled by an external personal computer. Experimental results show that the accuracy of the workpiece can be maintained within reasonable tolerance regardless of the length and shape being machined.
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