Metrology is an important part of any process that requires precision and validation. Metrology can be applied to parts, sub-assemblies and final assemblies. A few examples of applications where precision metrology is used include: Post-assembly inspection, incoming inspection of parts to verify supplier quality, binning of parts so they can be used for selective assembly, and process verification like measuring the dispense volume and position of adhesives. The process starts with understanding the application, parts and assemblies that are required and understanding the Manual Standard Operation Procedure (MSOP). The scope of this article is to discuss, from an inspection equipment design perspective, the process of allocating tolerances to the mechanical and vision system components for a given part's dimensional tolerance.
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