In-line Inspection of Roundness Using Machine Vision

It is a common practice for any manufacturers to control the quality of their product in order to satisfy the customers’ needs. This is particularly important for most machined parts which require a stringent dimensional and geometrical control. Once a machined part is produced, an inspection process is carried out to check whether the part is within specified tolerances. The purpose of the inspection procedure is to ensure that the part will meet its functional and performance requirements in their overall assembly. One of the most important tolerances to be controlled on a cylindrical machined part is the roundness error. A roundness measuring machine (RMM) and coordinate measuring machine (CMM) are the general metrological equipment used for inspection of roundness which normally performed in a quality room. This study aims to develop an in-line inspection of roundness error using machine vision. The system is developed with a machine vision (camera), work holding tools, lighting device and also image processing software for roundness evaluation. An automotive camshaft has been taken as a sample of the cylindrical part.