Design and Implementation of an Interlaboratory Comparison Process for Task – Specific CMM Measurements


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Abstract


In today's industrial environment the wide recognition of the Coordinate Measuring Machines (CMM) as universal tool for dimensional metrology tasks in most stages of a product life cycle makes the decisions that are based on CMM measurements particularly critical. However, CMM versatility coupled with the variety of the uncertainty-influencing factors make the analytical CMM uncertainty calculation a particularly complicated and time-consuming task. Despite to the growing use of CMMs in industry, the establishment of time and cost effective techniques and tools, which are focused on industrial metrology problems, and can, at the same time, provide for a scientifically sound approach to CMM uncertainty assessment has not yet been achieved to a satisfactory level. Interlaboratory comparisons are an important tool of metrology and are mandatory for laboratories accredited according to ISO/IEC 17025 and EN 45003. The paper presents a process including the design, implementation and evaluation of an interlaboratory comparison study that concerns specific dimensional measurement tasks which are carried out with the use of CMMs. The interlaboratory comparison aims to analyze the capabilities, as well as, the CMM techniques, methods and practices of the involved laboratories in a potentially shorter lead time with substantial savings. The designed process was implemented on an interlaboratory comparison involving (i) the Metrotechnics Laboratory of the Mechanical Engineering School in NTUA and (ii) the Rapid Prototyping & Tooling – Reverse Engineering Laboratory of the same NTUA School. The specified measurement tasks were based on the ISO 10360 series and were performed by bridge type CMMs. The analysis of acquired measurement results illustrates a satisfactory level of conformance between the two laboratories and leads to a positive evaluation of the proposed process.
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Keywords


Industrial Dimensional Metrology; Coordinate Measuring Machines; Measurement Uncertainty; Interlaboratory Comparisons

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References


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