SEDL / STP / STP1236-EB / STP13055S

Pitch Diameter Measurement of Threaded Gages Using a Coordinate Measuring Machine

Veale, R
Metrologist, U.S. Department of Commerce, National Institute of Standards and Technology (NIST), Manufacturing Engineering Laboratory, Precision Engineering Division, Mid-Scale & Complex Form Metrology Group, Gaithersburg, MD

Erber, E
Metrologist, U.S. Department of Commerce, National Institute of Standards and Technology (NIST), Manufacturing Engineering Laboratory, Precision Engineering Division, Mid-Scale & Complex Form Metrology Group, Gaithersburg, MD

Borchardt, B
Metrologist, U.S. Department of Commerce, National Institute of Standards and Technology (NIST), Manufacturing Engineering Laboratory, Precision Engineering Division, Mid-Scale & Complex Form Metrology Group, Gaithersburg, MD

Pages: 11    Published: Jan 1995

Download this paper for $25 PDF (188K)          View License Agreement
Abstract

The reference datum for a screw thread is the pitch diameter cylinder. Although a defined method within the United States for pitch diameter measurement exists, it does not follow worldwide procedures, and the complexity and uncertainties associated with this measurement often go unappreciated. Some of the problems associated with using a coordinate measuring machine (CMM) for measurements on both external and internal threads will be iscussed.