STEP-GAUGE CALIBRATION USING AN INTERFEROMETRIC COORDINATE MEASURING MACHINE AND THE UNCERTAINTY

Sonko Osawa, Toshiyuki Takatsuji, Tomizo Kurosawa
Abstract:
There are many kinds of geometrical gauges used for calibration of machine tools and coordinate measuring machines (CMMs). A step-gauge is a kind of calibration gauge. It consists of many short gauge blocks and a base bar. Gauge blocks were directly calibrated by an interferometer using method of exact fraction. The method, however, does not apply to the calibration of step-gauges because of their complicated structure. The calibration works are very important missions in national metrology institutes (NMIs). We developed the step-gauge calibration system that consisted of a CMM and an interferometer. We describe the system scheme of a step-gauge calibration system using a conventional CMM combined with an interferometer and the evaluation of the measurement uncertainty. The uncertainty in measurement using this system is about 0.5 ┬Ám (k = 2) for 1-meter measurement.
Keywords:
step-gauge calibration, uncertainty, Coordinate measuring machine, traceability
Download:
PWC-2003-TC14-033.pdf
DOI:
-
Event details
Event name:
XVII IMEKO World Congress
Title:

Metrology in the 3rd Millennium

Place:
Dubrovnik, CROATIA
Time:
22 June 2003 - 28 June 2003