Gauge Go-No-Go
The gauge Go-No-Go is an indispensable tool in the quality control of mechanical production. But in practice, how can you ensure that each component meets the technical specifications? Despite a rigorous 100% control, defects can slip through and compromise the quality of the final product. In this article we want to bring you the analysis of a real case of pitch error in splines, highlighting the limits of partial control rings.
Gauge Go-No-Go: problem analysis
We are in the field of splined shaft production, where quality control uses the gauge go-no-go to verify that critical dimensions are within tolerances. In this context, the control was performed 100% with partial control rings, designed to ensure the dimensional conformity of the components.
Despite the use of gauge go-no-go, during a more detailed final inspection, some splined pieces were found to be non-compliant. Investigations revealed that abnormal wear on the hobbing tool had caused a pitch error in the splines. This defect was overlooked because the partial check rings only checked a portion of the splines, not each tooth individually.
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The use of partial check rings proved insufficient to identify all potential defects. While they are useful for a quick check, they do not fully replicate the mating conditions of the parts, leaving "blind spots" where defects can go unnoticed. Gauge Go-no-go must simulate all conditions of use to ensure a complete and accurate check.
Lessons learned
This experience highlights the need to re-evaluate the use of partial check rings in critical settings. Checking tools must be appropriate for the complexity of the part and capable of detecting even the smallest defects. Furthermore, continuous monitoring of the condition of the tools is crucial to prevent similar problems in the future.
Go-no-go swabs offer time and resource advantages, but have limitations in detecting complex defects such as pitch error in flutes. This case highlights the importance of a thorough evaluation of inspection methodologies and continuous monitoring of tools to ensure the quality of the final product. For more information, contact [email protected].