Bolt Thread Inspection
Various defects are detected on outer or inner threads (both nut and bolt threads). Dents, scratches, burrs or debris are clearly recognized. The vision based gauging replaces costly thread plug gauging.
The individual use of artificial intelligence methods, albeit in combination with standard approaches used in machine learning, does not produce as good results as when combined with a fine 3D surface structure and several transformation methods.
Additionally, sectional light with sufficient amount of sections allows us to completely eliminate all reflections and effects of color rendering. It suppresses irrelevant artefacts, which don’t have impact on the final product quality but could otherwise distort the evaluation.
Reflections and other negative artefacts are hard to eliminate effectively and completely using standard machine vision techniques and setups. Setups without sectional light can lead to an increasing amount of false alarms (false positive detections).