This was pretty much the set up we had over at the last place I worked.Randy Stewart said:...are you really going to calibrate employee owned tooling or is it feasible to validate them at a given period?...What I have done in the past was only to validate on an annual basis and to classify the tools as "pass", "fail" or "pass with exception"...It may be easier to just have a set of gauge blocks calibrated and check the tools on a schedule.
The difference between there and here is - there we were making prototype metal stampings and likely had dozens of extra blanks for any one job; here one scrapped part could cost thousands of dollars. Also, the metal stampings we did there had a lot more tolerance than we typically see for the products we make here.
One of our inspectors is the cal.tech and it takes him about 1-2 hours a week to stay on top of company owned and employee owned gages.
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