128 ◾ Lean Production Simplified, Third Edition
3. Mis-set work pieces (e.g., piece set backward and weld applied to
wrong place)
4. Missing parts
5. Wrong parts
6. Wrong work piece processed
7. Faulty machine operation
8. Adjustment errors (e.g., error in cutting machine adjustment leads to
part being cut too thin or too fat)
9. Equipment not set up properly
10. Tools and jigs inadequately prepared
A good poka-yoke satisfies the following requirements:
◾ Simple, with long life and low maintenance
◾ High reliability
◾ Low cost
◾ Designed for workplace conditions
Shop floor team members are usually the best source of poka-yokes.
Inspection Systems and Zone Control
At Toyota I came to appreciate the concept of “zone control.” Each succes- ...