A new method of measuring large diameters has been presented. It has many valuable properties, such as that both external and internal diameters can be measured and there is no upper limitation of measuring range in theory. In addition, the measuring apparatus is compact and portable. Its structure is simple and cost is low. The theoretical estimation of uncertainty (omitted in this extended abstract) pointed out that, without considering the non-circularity of the workpiece, the extended uncertainty (3σ) will be (0.002+1x10~(-5) D) mm or less. The results of the repeatability and comparison experiments proved this conclusion.
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