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NOTICE :

NOTICE : This presentation is part of a presentation that was given at the March 2008 “ Lunch N Learn ” at J&H Machine Tools in Charlotte. The presentation is meant to be viewed with the narration and detailed explanation of the presenter. Understanding True Position.

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  1. NOTICE : This presentation is part of a presentation that was given at the March 2008 “Lunch N Learn” at J&H Machine Tools in Charlotte. The presentation is meant to be viewed with the narration and detailed explanation of the presenter.

  2. Understanding True Position Best Fit of Bore Pattern A portion of the “True Position Part III” LNL presentation.

  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

  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.

  5. Top Tier 3x 10 10 10 Ø 0.2 A B C C 10 20 -A- B

  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

  7. Bottom Tier 3x 10 10 Ø 0.1 A 10 -A-

  8. Bottom Tier Zone Location 3x 10 10 Ø 0.1 A Dia = 0.1 10 -A-

  9. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A-

  10. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A-

  11. 10 10 10 Bottom Tier Zone Location 3x Ø 0.1 A Dia = 0.1 -A-

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

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

  14. In Calypso……

  15. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Let’s Check the Bottom Tier. -A-

  16. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A-

  17. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A-

  18. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A-

  19. An Example… Here are ACTUAL center points. Are they in Spec? Ø 0.2 A B C Ø 0.1 A -A-

  20. An Example… Here are ACTUAL center points. Are they in Spec? BAD! Ø 0.2 A B C Ø 0.1 A -A-

  21. In Calypso……

  22. Ø 0.2 A B C Ø 0.1 A

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