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D.Hub
KOEN
Manufacturing
90 min

Choose a CNC inspection order from three HIGH alerts

Act as a fictional FabriSense maintenance specialist and use sensor quality signals, health scores, and machine relationships to order three CNC inspections.

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A maintenance shift with three simultaneous alerts

The morning shift has started at the fictional CNC manufacturer FabriSense. CNC-03, CNC-05, and CNC-09 all show HIGH alerts. There is only one maintenance crew, so they need a first stop without discarding the other two warnings.

Today, you are the FabriSense maintenance specialist answering this question:

Which CNC machine should we inspect first to prevent a failure, and what evidence supports that order?

A fictional FabriSense maintenance specialist compares alerts from three CNC machines and selects the first inspection target
Fictional scenario illustration — an AI-generated image of ordering three HIGH alerts, not a real product screen.

Decision criteria for this mission

  • Perspectives in play — Maintenance analysis determines whether each alert came from a statistical threshold or an explicit condition signal. Field operations chooses the first stop for one crew while preserving the remaining inspection scope.
  • Decision constraints — CNC-03, CNC-05, and CNC-09 are all HIGH, and each has a health score of 90. Choosing a first machine does not justify returning the other two to normal operation.
  • Completion signals — Explain the source of all three alerts, use the published Workshop tie-break rule to place CNC-03 first, and leave a maintenance-event relationship that the next specialist can retrace.

Workshop goals

  • Read sensor values together with quality_flag to identify the source of an alert.
  • Explain in plain language what a three-sigma check finds.
  • Compress three anomaly rows into machine health scores and an inspection order.
  • Recheck the decision through machine, sensor, and maintenance-event relationships.
  • Separate an operational policy from the workshop's tie-break rule.

Seven decisions

Loading the diagram. Mermaid source:

flowchart LR
    accTitle: Seven decisions for ordering CNC inspections
    accDescr: Start with three alerts, read the sensor evidence and three-sigma rule, set the inspection order, trace machine context, check the core reasoning, and explain the maintenance decision.
    warnings["1. Confirm three alerts"] --> evidence["2. Read sensor evidence"]
    evidence --> sigma["3. Understand 3-sigma"]
    sigma --> order["4. Set inspection order"]
    order --> context["5. Trace machine context"]
    context --> check["6. Check understanding"]
    check --> explain["7. Explain the decision"]

Each chapter follows question → reason → action → observation → interpretation → next decision. Instead of memorizing every asset, narrow the evidence needed to choose the first inspection.

Before you begin

  • An engineer or maintenance-analyst account with Editor access or higher
  • Enough download space for a scenario ZIP of about 25 KB
  • About 90 minutes

You do not need a terminal, Python, or a clone of dhub2-examples. If scenario import is new to you, start with Import and tour a complete hands-on scenario.

Learning journey

  1. Start with three HIGH alerts15 minImport the IoT scenario and separate the evidence needed to order three machine inspections.
  2. Read sensor values and quality signals together15 minInspect 20 sensor rows and trace the three HIGH alerts to their source values, units, and quality signals.
  3. Understand the three-sigma check intuitively15 minCompare each sensor with its normal distribution and distinguish a statistical alert from an explicit quality signal.
  4. Turn alerts into an inspection order20 minCompress three HIGH alerts into machine health scores and use the operations dashboard to choose a first inspection.
  5. Trace machine, sensor, and maintenance-event context15 minMaterialize the IoT ontology and inspect sensor configuration separately from the maintenance event created by a HIGH alert.
  6. Check the core maintenance reasoning5 minBefore explaining the final decision, review the alert source, sigma rule, machine relationships, and inspection scope in four questions.
  7. Explain the maintenance decision with evidence5 minReturn to the shift question and explain both the inspection scope and the first stop among three HIGH machines.