Abstract
The examples of measurement of three variants of the parallelism of the connecting-rod center axes the theoretical basis of a new method for estimating the uncertainty of coordinate measurements. This is a continuation of the article “Estimation of coordinate measurement uncertainty – theoretical fundamentals” (Mechanik 11, 2018). In the first variant, this tolerance field is in the form of a cylinder, in the other two it has the form of a pair of planes. In the examples presented, uncertainty budgets contain six or nine input factors. In all cases, when the axes of the measured holes are parallel to one of the machine axes, only two input factors affect the uncertainty of the measurement of parallelism deviation.
Highlights
WOJCIECH PŁOWUCHA *On the examples of measurement of three variants of the parallelism of the connecting-rod centre axes the theoretical basis of a new method for estimating the uncertainty of coordinate measurements is presented
Basics and important assumptions of the new method developed at ATH for estimating the uncertainty in coordinate measurements are presented in publications [1, 2]
The approach directly resulting from the recommendations of the GUM guide [5] was used: starting point is the measurement model in the form of a formula for the measured characteristics, and the sensitivity coefficients are values of partial derivatives calculated from the measurement model
Summary
On the examples of measurement of three variants of the parallelism of the connecting-rod centre axes the theoretical basis of a new method for estimating the uncertainty of coordinate measurements is presented. This is a continuation of the article “Estimation of coordinate measurement uncertainty by means of sensitivity analysis – theoretical background” (Mechanik 11, 2018). Uncertainty budgets contain six or nine input factors. In all cases, when the axes of the measured holes are parallel to one of the machine axes, only two input factors affect the uncertainty of the measurement of parallelism deviation.
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