With this formulation the manufacturing cost of any

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ction of design requirements and hence set the starting point of optimization. over inc. IT 1 2 3 4 5 6 .. 1 3 0.8 1.2 2 3 4 6 … 3 6 1 1.5 2.5 4 5 8 6 10 1 1.5 2.5 4 6 9 10 18 1.2 2 3 5 8 11 Nominal Sizes (mm) 18 30 50 30 50 80 Tolerance zone in μm 1.5 1.5 2 2.5 2.5 3 4 4 5 6 7 8 9 11 13 13 16 19 80 120 2.5 4 6 10 15 22 120 180 3.5 5 8 12 18 25 180 250 4.5 7 10 14 20 29 250 315 6 8 12 16 23 32 Table II; ISO tolerance zone. 4. TOLERANCE ASSIGNMENT BASED ON SENSITIVITY ANALYSIS The initial assignment of economic IT grade, however, does not ensure satisfactory finish product. Improvement of the tolerance assignment plan is essential if the stack up analysis indicates that the finish product does not meet some or all design requirements. Before involving complicated optimization algorithm, a sensitivity analysis based method can assist the re-assignment. The developed Monte Carlo simulation based tolerance stack up module can analyze both tolerance stack up and the sensitivity of feature variation to error sources [S...
View Full Document

Ask a homework question - tutors are online