Quality Assurance

219Poka-Yoke

• Sequence restriction

• Standardize and solve

• Critical condition indicator

• Detect delivery chute

• Stopper/gate

• Sensor

• Mistake proof your error-proof device. This is the most misun-

derstood item in device implementation. This addresses the lack

of good maintenance that can render the most brilliant error-

proong device useless—or even dangerous. Dangerous because

if precautions are not taken, you can assume that the device is

watching your quality or safety when it is not. To avoid this, you

must regularly maintain every non-mechanical error-proong

device. This includes sensors, limit switches, counters, gates and

stoppers, and any other device that relies on electricity, tempera-

ture and pressure gauging, or tolerances. ...