RT Journal Article T1 Squareness error calibration of a CMM for quality control of ophthalmic lenses A1 Quiroga Mellado, Juan Antonio A1 Rodríguez Ibáñez, Diego A1 Alonso Fernández, José AB This paper proposes a calibration procedure for the squareness error of small-sized coordinate measuring machines like those used for ophthalmic lenses quality control. The proposed procedure only requires a spherical lens as a reference surface and it only needs to be measured once making this calibration method faster and cheaper than the existing ones. PB Springer London Ltd. SN 0268-3768 YR 2013 FD 2013-09 LK https://hdl.handle.net/20.500.14352/33371 UL https://hdl.handle.net/20.500.14352/33371 LA eng NO © The Author(s) 2013. This article is published with open access at Springerlink.com.This work was supported by the Spanish Ministry of Science and Technology under grant DPI2009-09023. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. NO Spanish Ministry of Science and Technology DS Docta Complutense RD 9 abr 2025