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. Last Updated: 9/29/2014True Position Bore Pattern1

Part 3 : Best Fit of Bore Pattern Last Updated: 8/27/2014Understanding True Position2

10 True Position of the Three Holes 3x Ø 0.2 A B C Ø 0.1 A Last Updated: 9/29/2014True Position Bore Pattern3 C -A- B 10 20

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. Last Updated: 9/29/2014True Position Bore Pattern4

A- B Top Tier Last Updated: 9/29/2014True Position Bore Pattern5 3x Ø 0.2 A B C C

Top Tier Tolerance Zone Location A- C B X 20 Y 20 Dia = 0.2 X 30 Y 30 Dia = 0.2 X 10 Y 30 Dia = 0.2 Last Updated: 9/29/2014True Position Bore Pattern6 3x Ø 0.2 A B C

Bottom Tier 10 -A- Last Updated: 9/29/2014True Position Bore Pattern7 Ø 0.1 A 3x

Bottom Tier Zone Location -A- 10 Dia = 0.1 Last Updated: 9/29/2014True Position Bore Pattern8 Ø 0.1 A 3x

Bottom Tier Zone Location -A- 10 Dia = 0.1 Last Updated: 9/29/2014True Position Bore Pattern9 Ø 0.1 A 3x

Bottom Tier Zone Location -A- 10 Dia = 0.1 Last Updated: 9/29/2014True Position Bore Pattern10 Ø 0.1 A 3x

Bottom Tier Zone Location -A- 3x 10 Dia = 0.1 Last Updated: 9/29/2014True Position Bore Pattern11 Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Let’s Check the Top Tier. Last Updated: 9/29/2014True Position Bore Pattern12

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern13 Ø 0.2 A B C

In Calypso…… Last Updated: 9/29/2014True Position Bore Pattern14

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An Example… Here are ACTUAL center points. Are they in Spec? -A- Let’s Check the Bottom Tier. Last Updated: 9/29/2014True Position Bore Pattern19 Ø 0.2 A B C Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern20 Ø 0.2 A B C Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern21 Ø 0.2 A B C Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern22 Ø 0.2 A B C Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern23 Ø 0.2 A B C Ø 0.1 A

An Example… Here are ACTUAL center points. Are they in Spec? -A- Last Updated: 9/29/2014True Position Bore Pattern24 Ø 0.2 A B C Ø 0.1 A

In Calypso…… Last Updated: 9/29/2014True Position Bore Pattern25

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Last Updated: 9/29/2014True Position Bore Pattern29 Ø 0.2 A B C Ø 0.1 A