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A newly conceived cylinder measuring machine and methods that eliminate the spindle errors

Abstract : Advanced manufacturing processes require improving dimensional metrology applications to reach a nanometric accuracy level. Such measurements may be carried out using conventional highly accurate roundness measuring machines. On these machines, the metrology loop goes through the probing and the mechanical guiding elements. Hence, external forces, strain and thermal expansion are transmitted to the metrological structure through the supporting structure, thereby reducing measurement quality. The obtained measurement also combines both the motion error of the guiding system and the form error of the artifact. Detailed uncertainty budgeting might be improved, using error separation methods (multi-step, reversal and multi-probe error separation methods, etc), enabling identification of the systematic (synchronous or repeatable) guiding system motion errors as well as form error of the artifact. Nevertheless, the performance of this kind of machine is limited by the repeatability level of the mechanical guiding elements, which usually exceeds 25 nm (in the case of an air bearing spindle and a linear bearing). In order to guarantee a 5 nm measurement uncertainty level,LNE is currently developing an original machine dedicated to form measurement oncylindrical and spherical artifacts with an ultra-high level of accuracy. The architecture of thismachine is based on the ‘dissociated metrological technique’ principle and contains referenceprobes and cylinder. The form errors of both cylindrical artifact and reference cylinder areobtained after a mathematical combination between the information given by the probesensing the artifact and the information given by the probe sensing the reference cylinder byapplying the modified multi-step separation method.
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Alain Vissiere, Hichem Nouira, Mohamed Damak, Olivier Gibaru, Jean Marie David. A newly conceived cylinder measuring machine and methods that eliminate the spindle errors. Measurement Science and Technology, IOP Publishing, 2012, 23 (9), pp.10. ⟨10.1088/0957-0233/23/9/094015⟩. ⟨hal-01084382⟩



Les métriques sont temporairement indisponibles