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ISE 370 TOLERANCES

ISE 370 TOLERANCES. Performance Factors > Dimensions Linear Angular > Surfaces. Tolerance Allowable Variation from the Dimension Difference Between the Maximum & Minimum Limits. Tolerances Techniques > Bilateral > Unilateral > Limit Dimension.

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ISE 370 TOLERANCES

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  1. ISE 370TOLERANCES

  2. Performance Factors> Dimensions Linear Angular > Surfaces

  3. ToleranceAllowable Variation from the DimensionDifference Between the Maximum & Minimum Limits

  4. Tolerances Techniques > Bilateral > Unilateral > Limit Dimension

  5. Geometric Attributes> Straightness > Flatness > Parallelism > Roundness, Circularity > Concentricity > Squareness > Angularity

  6. Straightness:The degree to which a part feature such as a line of axis is a straight line.Symbol

  7. Flatness:The extent to which all points on a surface lie in a single plane.Symbol

  8. Parallelism:The degree to which all points such as a surface are equidistant from a reference plane or line. Symbol

  9. Roundness, Circularity:The degree to which all points on the intersection of a hole & a plane perpendicular to the axis of revolution are equidistant from the axis.Symbol

  10. Concentricity:The degree which 2 or more part features, such as a cylindrical surface & a circular hole have a common axis.Symbol

  11. Perpendicularity:The degree which all points on a surface or line are 90 degrees from a reference plane or line.Symbol

  12. Angularity:The extent to which a surface is at a specified angle relative to a reference surface.Symbol

  13. Three Types of Fits:> Clearance > Interference Force > Transition

  14. Surface TextureDefined By: > Roughness > Waviness > Lay> Flaw

  15. Max Waviness Height – Max Waviness Width 0.002 – 0.5 0.030 (Cutoff Length) 63 Lay Symbol 32 0.010 (Max Roughness Spacing)Max Average Roughness – Min Average Roughness (Micro-Inches)Surface Texture

  16. Loss of Quality RepresentsLoss to Producer>Cost of Repairs>Cost of Rejects>Cost of Customer Dissatisfaction Loss to Society>Cost of Repairs>Cost of Operation>Cost of Maintenance

  17. Quadratic Loss Function LSL USLLoss Target x (Value) Loss = k (x – Target)2k = Cost Coefficient = Losssite / (Toleranceold)2

  18. Window Frame ExampleFind “width” tolerance…d1 = fall out dimensiond2 = too long dimensiond (target) = mean of d1 + d2 = ½ (d1 + d2) Convention Tolerance T0 = ½ (d2 - d1) Customer Tolerance Range: w = d +/- T0 Slats d d1 d2

  19. Loss FunctionL(width) = k (width – d)2k = Cost(site) / T02 (New Tolerance) TN = |width – d| Cost(mfg) = [Cost(site)/T02 ] * TN2New Tolerances: TN = √ Cost(mfg) / Cost(site) * T0

  20. Tolerance Summary > Products & processes should be designed so that they are robust to external sources of variability.> Experimental design methods are an engineering tool to help accomplish this objective.> Operation on-target is more important than conformance to specifications.

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