In the master's thesis, an issue was addressed concerning the gearbox manufacturing process. During the final product inspection, it was identified that two cylinders failed to meet the required cylindricity specifications. Both the existing and the improved processes were analyzed using control charts and histograms. The FMEA methodology was employed to explore potential root causes for these discrepancies. The production process was depicted and analyzed using IDEF0 diagrams, and measurements of the gearbox housings were undertaken with a coordinate measuring machine. Initially, it was confirmed that the existing process couldn't meet the set specifications. Utilizing the FMEA methodology, a potential cause for the deviation was identified. An improvement was subsequently introduced to correct the error within the process. The outcome of the analysis indicated that the improved process now meets the cylindricity requirements for the cylinders. Additionally, it was affirmed that the process is both stable and capable.
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