Andrews said:
Thanks everyone for your response.
Is there no way at all to improve effectiveness (i.e no defective pieces escape) of 100% inspection? how about changing the inspectors once in an hour ?
Andrews,
Everyone here wants to help, but it seems that you haven't gotten the message so far. Every inspection process is different. Not only is every inspection process different, but each process might be different each time it's run due to the nature and interactions of the variables involved. If you think that operator fatigue might be a factor that needs control, then by all means act accordingly. Perhaps, in some instances, fixed gages might help, or better lighting or better training...
Sometimes inspection processes can be improved, and sometimes they are what they are and nothing can be done about it. You have to evaluate each instance individually and make the best decision you can, then check to see if your decision was correct or not, and make adjustments if necessary. Plan, do, check, act.