In a sector where precision is critical and the margin for error is minimal, ETMA relies on advanced quality control tools to ensure the reliability of its components. Among these tools, one stands out: SPC – Statistical Process Control, a vital methodology that not only detects faults but prevents them before they even occur. This is the focus of this article.
WHAT IS SPC?
SPC is a statistics-based methodology used to monitor and control variables during the production process. Rather than detecting defects only at the end of the line, this approach allows trends and deviations to be identified in real time, enabling preventive action.
HOW DO WE APPLY SPC AT ETMA?
At ETMA, SPC (Statistical Process Control) is integrated at various stages of production, with a particular focus on core processes – from cold forging to turning, including stamping and wire forming. These processes are continuously monitored using data gathered from regular quality checks, creating a solid foundation for faster and more effective decision-making.
At the start of each project, we carry out machine capability studies (Cmk) to determine the actual capacity of the process and identify areas for improvement – always with the goal of ensuring stable processes with low variability.
During serial production, supported by a centralised database system, we monitor process performance in real time directly within the production area. This monitoring is carried out in close collaboration between the Quality and Production teams, enabling the swift implementation of corrective actions whenever necessary to ensure the capability indices agreed with our clients.
The key lies in this continuous monitoring and the ability to respond swiftly and effectively, ensuring the consistency and quality our clients expect.
At ETMA, SPC is applied across all production processes and is suitable for virtually all critical characteristics, including:
- Diameter, length, and geometric tolerances;
- Hardness and torque resistance;
- Coating thickness and uniformity of surface treatment.
All this information is processed using specialised software and displayed in real-time control charts, accessible to both the production and quality teams.
DIRECT BENEFITS FOR OUR CLIENTS
The systematic use of SPC results in:
- Reduced internal and external rejections;
- Lower costs associated with rework and returns;
- Greater predictability and stability in processes;
- Improved traceability and confidence in compliance reports.
This commitment to data-driven quality enables us to deliver millions of high-performance parts year after year — in demanding sectors such as automotive and electrotechnical.
CONCLUSION
At ETMA, we believe that quality is not something you inspect — it’s something you build. And data is our most powerful tool in that daily pursuit.
SPC is not just a control method; it is a culture of continuous improvement, where every detail is measured, analysed, and refined. Because, in the end, it is this level of precision our clients expect – and that we take pride in delivering.