TAILIEUCHUNG - Gauge Block Handbook by Ted Doiron and John Beers Dimensional Metrology Group

The Gauge Block Handbook by Ted Doiron and John Beers Dimensional Metrology Group Precision Engineering Division National Institute of Standards and Technology Preface The Dimensional Metrology Group, and its predecessors at the National Institute of Standards and Technology (formerly the National Bureau of Standards) have been involved in documenting the science of gauge block calibration almost continuously since the seminal work of Peters and Boyd in 1926 [1]. Unfortunately, most of this documentation has been in the form of reports and other internal documents that are difficult for the interested metrologist outside the Institute to obtain. On the occasion of. | The Gauge Block Handbook by Ted Doiron and John Beers Dimensional Metrology Group Precision Engineering Division National Institute of Standards and Technology Preface The Dimensional Metrology Group and its predecessors at the National Institute of Standards and Technology formerly the National Bureau of Standards have been involved in documenting the science of gauge block calibration almost continuously since the seminal work of Peters and Boyd in 1926 1 . Unfortunately most of this documentation has been in the form of reports and other internal documents that are difficult for the interested metrologist outside the Institute to obtain. On the occasion of the latest major revision of our calibration procedures we decided to assemble and extend the existing documentation of the NIST gauge block calibration program into one document. We use the word assemble rather than write because most of the techniques described have been documented by various members of the Dimensional Metrology Group over the last 20 years. Unfortunately much of the work is spread over multiple documents many of the details of the measurement process have changed since the publications were written and many large gaps in coverage exist. It is our hope that this handbook has assembled the best of the previous documentation and extended the coverage to completely describe the current gauge block calibration process. Many of the sections are based on previous documents since very little could be added in coverage. In particular the entire discussion of single wavelength interferometry is due to John Beers 2 the section on preparation of gauge blocks is due to Clyde Tucker 3 the section on the mechanical comparator techniques is predominantly from Beers and Tucker 4 and the appendix on drift eliminating designs is an adaptation for dimensional calibrations of the work of Joseph Cameron 5 on weighing designs. They have however been rewritten to make the handbook consistent in style and coverage.

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