Failure Mode and Effects Analysis

Failure Mode and Effects Analysis (FMEA) is a systematic, proactive tool used by engineering and quality teams. It helps identify where and how a process or product might fail. The analysis evaluates the potential impact of those failures.

The FMEA process involves a cross-functional team. The team brainstorms potential failure modes for each step of a process. They then rate each failure mode on three criteria: Severity (S), Occurrence (O), and Detection (D). Severity rates the seriousness of the failure's effect. Occurrence rates the likelihood that the failure will happen. Detection rates the ability of current controls to find the failure before it reaches the customer.

On the shop floor, FMEA helps prevent defects, improve operator safety, and reduce costs. It shifts the focus from reacting to problems to preventing them. For example, a team might use FMEA on a new CNC machining program. They can identify potential tool breakages or incorrect cuts before running the first part. This avoids scrap, machine damage, and production delays.

To implement FMEA, teams use a standardized worksheet to document their findings. They calculate a Risk Priority Number (RPN) for each failure mode. The team then develops and assigns action plans to address the highest RPN items. This ensures that the most critical risks are mitigated first.