Following the path of a cheap and cheerful ‘how to do it’ format of the last two columns, I continue with something easy – or is it?

In my last column I listed some basic equipment requirements for the calibration of thread plug gages so I thought it would be helpful to give mating gages the same treatment. 

Quality standards require that measuring equipment be calibrated prior to being put into service. In addition, the maintenance of measuring equipment requires recalibrations at regular intervals. 

Thread plug gages are fascinating products when you consider the technical details that go into their manufacture and the precision they embody. To some, they look like fancy bolts and are treated accordingly. 

My work in inspection, and as a quality management system auditor, provides numerous opportunities to acquire knowledge. It also provides areas of risk for ensuring valid and reliable results. 

One would hope that once a calibration laboratory has been accredited by a recognized agency, you could take the uncertainties shown on their scope of calibration at face value. 

Conversations around quality in metal additive manufacturing often focus on the flashy application of high-frequency, in situ, real-time monitoring systems and the neural networks or machine learning required for map-reduction of the mountains of data generated. There is, however, an often-overlooked aspect of consistently making high-quality parts: calibration.

I often take shots at those companies with great quality systems that get their calibration reports, scan them for red flags and then file them away if none are present.