The challenge was to gauge the diameters of critical holes (orifices) in cylindrical parts as it was rotated. The tolerances were as low as 0.0002″.
The solution was a system utilizing a vision inspection system triggered by a micro PLC. The micro PLC also operated the motor rotating the part and verified that the proper number of good holes were detected in each part. In tight tolerance parts a special inside-out illumination system was devised that provided a lighted plates tip inside the cylindrical part. This provide the consistent lighting required to reach such tight tolerances.