Error Compensation in CNC Turning Solely from Dimensional Measurements of Previously Machined Parts

Predicting Machining Errors in Turning Using Hybrid Learning

“…the data needed for enabling error compensation should be obtained essentially from normal shop floor operations. A review of relevant literature indicates that, with the exception of [2,3], there have been few attempts at developing such a system.…”

“…In [2,3], an attempt was made to develop an error compensation method that relied solely on post-process and on-machine measurements of parts previously machined on the same machine. It was argued that these measurements are routine and normal shop floor activities and, hence, the new approach meets the criterion of shop floor acceptability.…”

“…Thus, the machine would be able to progressively learn to perform the task of error compensation via software solely on the basis of dimensional measurements conducted on previously machined parts. Extensive data demonstrating the applicability of this approach to cylindrical turning on a CNC turning centre was presented in [2,3].…”

“…Another interesting feature of the error compensation strategy explored in [2,3] was the use of a novel on-machine measurement device called the "fine touch" contact sensor that was originally developed at Kiev Polytechnic, Ukraine. The fine touch sensor consists of a coil wound around the tool that produces an electrical signal when the tool contacts the workpiece.…”

“…Notwithstanding the demonstrated success of the error compensation approach described in [2,3], four difficulties associated with the approach are worth noting: The present paper aims to develop a modified error compensation strategy that addresses at least the first three of these four problems. The paper is organised as follows.…”