Transcription

1

2

3

4

5 Create MBE Vision Plan Identify Data Needs Assess PMI Consumption

6

7

8

9 3 DimXperts 2D Drawings Introduced with version D Parts Introduced with version D Assemblies Introduced with version 2016* *SOLIDWORKS MBD license required

10 Machined Parts Milled Drilled Turned Geometric and Plus-Minus Tolerance

11 Sheetmetal Bends not supported --- Use Reference Dimension Prismatic type features are supported (planes, holes, slots) Molded/Casted Parts Draft not supported Profile tolerancing is supported Use reference geometry (planes and intersections) Special Geometries Including gears, threads and cams

12

13

14

15 Hole Cone Countersink Counterbore Slot Notch Boss Cylinder Plane Pocket Surface Chamfer Fillet Width

16 Intersect Plane Intersect Line Intersect Point Plane intersection between a cylinder and a cone Line intersection between a two planes Point intersection between a cylinder and a plane

17 Model faces colored based on status Green = Fully Constrained Yellow = Under Constrained Red = Over Constrained Native Color = Not Recognized by DimXpert

18 Sketch Dimensions Facilitate part creation, configurations, design tables Linked to construction geometry not present in finished part Aren t always consistent with methods used for manufacturing Don t always meet requirements necessary to support geometric tolerancing

19

20 DimXpert Dimensions Communicate part s functional requirements for assembly, manufacturing and inspection Always associated with manufacturing features Always associated with a tolerance Dimensions (basic) associated with geometric tolerances originate from and are oriented to the datum reference frame

21

22 Tolerance type and values created by Size Dimension and Auto Dimension Scheme

23

24 Chain Baseline

25 1. ADS (Automatic Dimensioning Scheme) and Geometric Tolerancing 2. ADS and Plus-Minus Tolerancing 3. ADS and Selected Features 4. ADS and the Wedge 5. ADS and Concentric Features 6. Feature Selector 7. Manual Tolerancing 8. More Feature Selector

26

27

28

29

30 Plus and Minus Geometric

31

32 Location Dimension Size Dimension

33

34

35 Intersect Plane Intersect Line Intersect Point Plane intersection between a cylinder and a cone Line intersection between a two planes Point intersection between a cylinder and a plane

36 Notes BOM Title Blocks DimXpert and Reference Dimension Support in 2D Drawings

37

38

39

40

41

42

43

44

45 Tolerance stack-up analysis is the study of dimension and tolerance schemes to determine potential form, fit, and function problems in parts and assemblies Included with SOLIDWORKS Professional and Premium What the permissible gap (G) between Part1 and Part4?

46 Assumes dimensions vary within the entire range of their tolerance zones and that the accumulation of tolerances will experience all possible variations G min = L 1 + L 2 + L 3 + L 4 + L n = L 1 + L 2 + L 3 + L 4 = (-60.75) + (-42) + (-50.5) = -0.5 Interference

47 Assumes dimensions vary randomly within a normal distribution (±3σ) centered about midpoint of the tolerance zone. G = G nominal ± T T T 32 T N 2 = 2 ± = 2 ± G min = 0.631, G max = G nominal = = 2

48 It is incorrect to think max worst case is when the parts are at their largest and min worst case is when they are at their smallest Part Nominal Assembly Worst-case Maximum Worst-case Minimum

49 Functional Requirement: D >= 39

50 Top Plate Angle Bracket Bushing

51 To reduce the tolerance stack by 0.8 ( ) the tolerance of each dimension would have to be changed to ± 0.1 Before After

52 By increasing the width between the faces locating the two angle brackets by 1 mm the results for the minimum worst-case gap would be 39.2 ( ) Before After

53 By adding a dimension between the planes which locate the axel supports and removing the 40 dimension on the right side of the part the tolerance stack between the planes is reduced from ± 1.1 to ± 0.3. As a result the new worst-case minimum dimension would be 39. Before Before After

54

55

56

57 Create MBE Vision Plan Identify Data Needs Assess PMI Consumption

58