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    Role

    Engineering and planning: what changed?

    Process and production engineering need to understand what has changed, what it affects, and whether the standard should change.

    Questions and decisions

    From question to evidence

    Each question needs certain evidence to be answered. Together they lead to what the role needs afterwards.

    1. Question 1: "What changed?"

      Needs: History for the process

    2. Question 2: "What is affected?"

      Needs: When tools, material or settings were changed

    3. Question 3: "Should the standard change?"

      Needs: Earlier similar events

    Afterwards

    A changed standard or instruction, with the effect visible in the next period.

    Situations

    Where the questions arise

    Each situation is described once. Here you see the question and the decision for this particular role.

    Behind the questions

    Does the dimension follow a process value?

    When a process value, for example the temperature, is saved with the same serial number as the dimension, you can see whether they move together. The serial number is an annotation on the measured value. A correlation shows where it is worth looking for what changed, not what caused it.

    Solution: Measurement data collection →

    Does the dimension follow a process value, for example the temperature?

    Illustration · Example data
    USL25.00LSL45 °C50 °C55 °CMould temperature in the cycle, from the machineDimension, mmClose to USL at high temperatureOne circle = one part (same serial number)

    When the process value and the dimension belong to the same part, through the serial number, you can see whether they move together. A correlation shows where it is worth looking. It does not prove what causes the deviation.

    Step by step

    • Each point is one part. The mould temperature comes from the machine and the dimension from the measurement, and they are linked by the serial number of the part.
    • The dimension should be 25.00 ± 0.10. Every part in the example is within tolerance.
    • The higher the temperature, the larger the dimension. The parts from the hottest cycles, above about 55 °C, are close to the upper tolerance limit.
    • The correlation shows where it is worth investigating. It does not prove that the temperature is the cause.

    Why do annotations make a measured value more useful?

    Illustration · Example data

    A value without context can only be compared with its limit. With operator, serial number, order, machine and cavity it can be filtered, compared and traced.

    Step by step

    • The value 12.51 is linked to operator, serial number, order, machine and cavity.
    • The cavity number makes it possible to compare cavities with each other.
    • Serial number and order make it possible to trace a single part and answer the customer.

    Other roles, same situations

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