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March Luncheon 2008 Learn 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.

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March Luncheon 2008 Learn Understanding True Position Best Fit of Bore Pattern A portion of the “ True Position Part III ” LNL presentation.

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March Luncheon 2008 Learn True Position of the Three Holes A- C 3x B Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn This is a True Position with a COMPOSITE TOLERANCE. Ø 0.2 A B C Ø 0.1 A 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. 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.

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March Luncheon 2008 Learn Top Tier A- C 3x B Ø 0.2 A B C

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March Luncheon 2008 Learn Top Tier Tolerance Zone Location A- C 3x B Ø 0.2 A B C X 20 Y 20 Dia = 0.2 X 30 Y 30 Dia = 0.2 X 10 Y 30 Dia = 0.2

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March Luncheon 2008 Learn Bottom Tier 10 -A- 3x Ø 0.1 A

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March Luncheon 2008 Learn Bottom Tier Zone Location -A- 3x Ø 0.1 A 10 Dia = 0.1

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March Luncheon 2008 Learn Bottom Tier Zone Location -A- 3x Ø 0.1 A 10 Dia = 0.1

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March Luncheon 2008 Learn Bottom Tier Zone Location -A- 3x Ø 0.1 A 10 Dia = 0.1

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March Luncheon 2008 Learn Bottom Tier Zone Location -A- 3x Ø 0.1 A 10 Dia = 0.1

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Let ’ s Check the Top Tier.

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C

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March Luncheon 2008 Learn In Calypso……

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Let ’ s Check the Bottom Tier.

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn An Example… Here are ACTUAL center points. Are they in Spec? -A- Ø 0.2 A B C Ø 0.1 A

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March Luncheon 2008 Learn In Calypso……

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn

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March Luncheon 2008 Learn Ø 0.2 A B C Ø 0.1 A

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