Solder Joint Acceptance: Reading IPC Classes Without Over-Rejecting
Most false rejects at the inspection bench come from applying Class 3 habits to Class 2 product. Here is how…
Six Sigma & Data
147 articles
Coating Thickness Conformity Is Decided by Measurement Location
Most plating thickness disputes are not about chemistry or process capability. They are about which region of the part the…
Pilot Parts That Flatter You: How Prototype Processes Overstate Production Capability
Prototype parts answer questions of design and fit, not of process capability. Here is why pilot data flatters production, and…
Burn-In Economics: Screening Cost Versus Escaped Infant Mortality
How to size, monitor and eventually retire a burn-in screen using failure physics, fallout signatures and life-consumption arithmetic rather than…
Survival Analysis for Warranty Data: Getting Censored Units Right
Most units in a warranty fleet have not failed yet. Here is how to use censored data, Kaplan-Meier curves and…
MTBF Is a Rate, Not a Lifespan: How to Use It Without Being Misled
Why the most quoted reliability figure describes almost nothing you care about, and what to demand instead: Weibull shape parameters,…
Utility Variation: The Process Input Your Documentation Never Lists
Compressed air, electrical power and water are treated as constants in process definitions. They vary, and the variation produces defects…
Bayesian Updating for Quality Decisions: Turning Prior Knowledge Into Production Evidence
How beta-binomial models, defensible priors and sequential updating let quality engineers make launch decisions on small samples without discarding what…
Remanufacturing Quality: Controlling a Process Whose Input Will Not Conform
Cores arrive worn, misidentified and secretly repaired. This is how to build assessment, grading, process control and warranty structures that…
Component Derating as a Quality Policy, Not a Design Preference
Reliability is decided at the schematic or not at all. This is how to turn derating from a designer's habit…