Auditing Machine Controller Telemetry Logs during Formal Manufacturing Baseline Inspection
Auditing raw controller telemetry during baseline inspection uncovers hidden micro-stoppages, clock drift, and suppressed fault flags before sign-off.
Machine Capability Index
Meaning
Statistical indices evaluate the inherent precision of a specific piece of equipment under controlled conditions. The machine capability index measures the ability of a tool to produce parts within a specified tolerance range when external variables like operator skill or material changes are removed. It is calculated by comparing the spread of the machine output to the width of the engineering specifications.
A high index value indicates a machine that is well suited for the task.
Precision Ratio
Calculations for the index use data from a short, continuous run of identical parts. The ratio is determined by dividing the total tolerance width by six standard deviations of the measured output. This result shows how much of the specification range is consumed by the machine’s own variation.
Process Potential
Knowing the index value allows engineers to predict the minimum possible scrap rate for a new product. If the machine capability index is less than 1.33, the equipment might not be reliable enough for high volume production. This assessment is done before the tool is integrated into a full production line.
Yield Prediction
Manufacturers use this metric to decide if a machine requires an upgrade or a specialized maintenance schedule. A machine with a low index will produce more defective parts as the tool wears down over time. Measuring the index during the pilot phase prevents the cost of high rejection rates in full production.