As a supplier of all types of measuring instruments, we are regularly asked to quote the cost of repairing some of them. In days gone by, it was a common service offered by many in the industry but modern technology has changed all that while increasing the amount of garbage to the local landfill. Marketing and manufacturing are both to blame.
Our industry is fraught with tales of quality audits from hell and other less than desirable places, usually the result of standards written by folks who know a little but expand it to encompass a lot.
In my last column I noted that I would give some hints to help you avoid problems with assigning and applying acceptance limits, so let’s go back to square one.
More companies than ever are downloading decisions to calibration laboratories causing perfectly acceptable gages and instruments to be ‘failed’ by them. How could such a thing happen?
Some of the data I’ve noted from the AMTMA studies make it very clear that measurement disputes will continue. When the range of readings is close to or exceeds the tolerances of the gages being calibrated, it is a certainty. Further problems will occur due to unrealistic expectations by all the parties involved in a dispute.
The American Measuring Tool Manufacturers Association (AMTMA) is an organization whose members manufacture, supply, and/or calibrate precision gages and measuring instruments. If you use this type of equipment, the odds are it came from one or more AMTMA member companies.
The American Society of Mechanical Engineers (ASME) has published a new standard that identifies elements that will impact measurement uncertainty from thread calibration processes.
Readers of this column are a gentle lot and not likely to run afoul of criminal law but can end up in a similarly frustrating situation that limits their working life.
This is an area of gage making that takes something simple like a go/nogo plain plug gage and adds another feature for another check, such as hole depth.