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NOTICE :

NOTICE : This presentation was given at the March 2008 “ Lunch N Learn ” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with the narration and detailed explanation of the presenter. Part 3 : Best Fit of Bore Pattern. True Position of the Three Holes. 3x.

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  1. NOTICE : This presentation was given at the March 2008 “Lunch N Learn” at Ellison Technologies in Charlotte. The presentation is meant to be viewed with the narration and detailed explanation of the presenter. True Position Bore Pattern

  2. Part 3 : Best Fit of Bore Pattern Understanding True Position

  3. True Position of the Three Holes 3x 10 10 10 Ø 0.2 A B C Ø 0.1 A C 10 20 -A- B True Position Bore Pattern

  4. The Top “tier” controls the feature positions relative to the Datum Reference Frame. The tolerance zone is FULLY CONSTRAINED to the Specified Datums. This ensures the holes are located properly on the part. This is a True Position with a COMPOSITE TOLERANCE. Ø 0.2 A B C Ø 0.1 A The Bottom “tier” controls the pattern of holes to themselves, without positional or rotational constraints, in this case. This ensures that the pattern itself will mate with the joining part’s hole pattern. True Position Bore Pattern

  5. Top Tier 3x 10 10 10 Ø 0.2 A B C C 10 20 -A- B True Position Bore Pattern

  6. X 10 Y 30 Dia = 0.2 X 30 Y 30 Dia = 0.2 X 20 Y 20 Dia = 0.2 Top Tier Tolerance Zone Location 3x 10 10 10 Ø 0.2 A B C C 10 20 -A- B True Position Bore Pattern

  7. Bottom Tier 10 10 3x Ø 0.1 A 10 -A- True Position Bore Pattern

  8. Bottom Tier Zone Location 10 10 3x Ø 0.1 A Dia = 0.1 10 -A- True Position Bore Pattern

  9. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A- True Position Bore Pattern

  10. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A- True Position Bore Pattern

  11. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A- True Position Bore Pattern

  12. An Example… Here are ACTUAL center points. Are they in Spec? Let’s Check the Top Tier. -A- True Position Bore Pattern

  13. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Good! -A- True Position Bore Pattern

  14. In Calypso…… True Position Bore Pattern

  15. True Position Bore Pattern

  16. True Position Bore Pattern

  17. True Position Bore Pattern

  18. True Position Bore Pattern

  19. An Example… Here are ACTUAL center points. Are they in Spec? Let’s Check the Bottom Tier. Ø 0.2 A B C Ø 0.1 A -A- True Position Bore Pattern

  20. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A- True Position Bore Pattern

  21. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A- True Position Bore Pattern

  22. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A- True Position Bore Pattern

  23. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A- True Position Bore Pattern

  24. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A BAD! -A- True Position Bore Pattern

  25. In Calypso…… True Position Bore Pattern

  26. True Position Bore Pattern

  27. True Position Bore Pattern

  28. True Position Bore Pattern

  29. Ø 0.2 A B C Ø 0.1 A True Position Bore Pattern

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