Theoretical and Experimental Estimation of Uncertainty of Measurement during Calibration of CMM

Atul  Dev; Smriti  Tandon; Ved  Parkash

Atul Dev Centre for Advance Mechanical Engineering Defence Electronics Applications Laboratory, Dehradun, India, GraphicEra (Deemed to be University), Dehradun, India
Smriti Tandon Graphic Era (Deemed to be University), Dehradun, India
Ved Parkash Centre for Advance Mechanical Engineering Defence Electronics Applications Laboratory, Dehradun, India

Keywords: CMM, Calibration, Uncertainty, ength Measurement, Probability Distribution

Abstract

In the present paper we briefly discuss the universal (theoretical) and experimental methods of estimation of uncertainty of measurement. As an application we have taken the case of manual 3D co-ordinate measuring machine of with 1 µm least count and this machine has been calibrated with the help of a Step Gauge. The study concludes that both universal and experimental methods give fairly identical results and hence universal method can be used easily for the uncertainty calculation of such machines.This is first of its kind of work where theoretically estimated uncertainty value has been compared w.r.t. the practically observed value.

Downloads

Download data is not yet available.

References

Catalogue No. 6100/E/01/2000 (2000).Kolb & Baumann GMBH & Co. KG, Precision Step Gauge-KOBA Step, Aschaffenburg, Germany.

Catalogue No. 1000/97E (1997), Kolb & Baumann GMBH & Co. KG, Gauge Block and Accessories, Aschaffenburg, Germany.

Indian Standard, IS: 2984 –2003: Slip Gauges –Specifications, Second Revision, Bureau of Indian Standards, New Delhi.

NABL –141 (18 July 2016), Guidelines for Estimation and Expression of Uncertainty in Measurement, National Accreditation Board of Testing and Calibration Laboratories, New Delhi.

Shankar, N. (April 1999).Reducing Uncertainty in Measurement, Quality Today.

Taylor, B. N., & Kuyatt, C. E. (1994). Guidelines for evaluating and expressing the uncertainty of NIST measurement results. United States Department of Commerce Technology Administration National Institute of Standards and Technology.