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Aiming at the accurate and effective coaxiality measurement for twist drillwith irregular surface, an optical measurement mechanism is proposed in thispaper. First, A high-precision rotation instrument based on four core units isdesigned, which can obtain the 3-D point cloud data of full angle for the twistdrill. Second, in the data processing stage, an improved robust Gaussianmixture model is established for accurate and rapid blade back segmentation. Toimprove measurement efficiency, a rapid reconstruction method of the twistdrill axis based on orthogonal synthesis is provided to locate the axialposition of the maximum deviation from the benchmark by utilizing the extractedblade back data. Finally, by calculating the maximum radial Euclidean distancefrom the benchmark, the coaxiality error of the twist drill is obtained.Comparing with other measurement methods, experimental results show that ourproposed method is effective with high precision of 3 um and high efficiency ofless than 3 s/pc. The result demonstrate that the proposed method is effective,robust and automatic, it can be applied in many actual industrial scene.

An effective coaxiality measurement for twist drill based on line structured light sensor