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Preventive maintenance and shop quality · Lesson 4 of 4

Preventive maintenance and shop quality: defects, verification and case study

Defects that point at the machine or the measuring tools, root cause analysis, an illustrative case of marks along every bend worked through the 5 Whys and PDCA, the safety boundary for cleaning, and the evidence for review.

You will be able to: Trace a defect on the piece back to a machine or tool condition, find its root cause with the 5 Whys, fix it with a PDCA trial, and document the evidence a reviewer needs.

8 min · 11 slides · 6 questions

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Defects that point at the machine

The symptom on the piece, and the care task to check first:

  • Marks along the bends: dirty, rusty or burred tooling or clamp edge
  • Electronic faults: a blocked cabinet fan filter
  • Weak or fast-dropping clamp: clamping pressure or clamping bar action out of adjustment

Sources

Glossary

Root cause analysis
A systematic process to identify the underlying causes of problems, so they do not recur.
Corrective action
An action plan that addresses the root cause, the last step of root cause analysis in ASQ's outline.
PDCA cycle
Plan, Do, Check, Act: ASQ's four-step model for carrying out change, with a small-scale study in the Do step.