NPL provides a UKAS accredited calibration service (laboratory No. 0478) for measuring the diameter of grade AA plain setting rings ranging in size from 3 mm to 250 mm in diameter to comply with the requirements specified in British Standard Specification 4064:1966 Plain setting rings for use with internal diameter measuring machines (Metric Units) or 4065:1966 (Inch Units). Certificates of calibration give the diameter at mid-bore and the variation along the bore.
Roundness measurements in accordance with British Standard Specification 3730:1982 Assessment of departure from roundness are made at three positions. The maximum departure from roundness and the measured departure from roundness at mid-bore, using the minimum zone criterion, are stated.
NPL provides a UKAS accredited calibration service (laboratory No. 0478) for measuring the diameter of plain setting plugs, pins, rollers and thread* measuring cylinders in the range 0.1 mm to 150 mm diameter.
(*Thread measuring cylinders are measured in the range of 0.05 mm to 5 mm).
Further details of the calibration process can be provided upon request.
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