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Unformatted text preview: ; T) specifications on the various parts. These specifications must obviously reflect the clearance requirements at the assembly level. From there, at the modelling stage, tolerance zones for parts and sub-assemblies (if required) are defined. Meanwhile, on the production side, manufacturing and metrology uncertainties must be measured or estimated and combined to generate part uncertainty zones. If appropriate, fastening uncertainties may also be taken into account. In this instance however, it becomes necessary to distribute the global uncertainty zone at the assembly interface among the external surfaces of the sub-asssembly. Fastening uncertainties must be accounted for, when the corresponding processes introduce additional variations that could not be modelled at the part level. From there, a Geometrical Variations Management 81 comparison can be made between the tolerance zones on parts or sub-assemblies with their corresponding production phase uncertainty zones. Finally, if the latter is included in the former, than the process can be validated. 3.2. Product design validation For product design validation, the comparison is...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.
- Spring '10
- The Land