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Understanding True Position with MMC in Calypso

Understanding True Position with MMC in Calypso. This presentation shows how MMC applied to features and datums effect the calculation and evaluation of True Position characteristics.

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Understanding True Position with MMC in Calypso

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  1. Understanding True Position with MMC in Calypso True Position with MMC

  2. This presentation shows how MMC applied to features and datums effect the calculation and evaluation of True Position characteristics. For each case, the GD&T control frame for the True Position, Calypso characteristic window and Calypso custom printout to go with each True Position, and an explanation of each result is shown. True Position with MMC

  3. The Print: -A- C Ø 1.0 ± 0.1 typ 3 places A True Position Tolerance is given to this hole with MMC applied to feature and datums. B 10.0 True Position with MMC

  4. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 A B C Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=1 B 10.0 True Position with MMC

  5. Calypso Characteristic: Calypso Report: True Position with MMC

  6. Why the Answer?: The result for True Position can be thought of as the diameter of a circle, centered at the target (basic dimensions), that contains the actual center. -C- Center Y True Position Result = Ø 0.2 True Position Tolerance = Ø 0.1 Feature Target Center X -B- Center Feature Actual Center 10.0 10.1 True Position with MMC

  7. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 M A B C Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=1 B 10.0 True Position with MMC

  8. Calypso Characteristic: Calypso Report: True Position with MMC

  9. Why the Answer?: When MMC is applied to the Feature, the Tolerance Band grows by the amount of the bonus. (bonus = actual Ø – smallest allowable Ø for a hole at MMC) -C- Center Y True Position Result = Ø 0.2 True Position Tolerance with Bonus = Ø 0.2 Feature Target Center -B- Center X Feature Actual Center 10.0 10.1 True Position with MMC

  10. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 A B M C Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=1 B 10.0 True Position with MMC

  11. Calypso Characteristic: Calypso Report: True Position with MMC

  12. Y X When MMC is applied to the Centering Datum, the coordinate system center can move within a circle centered at the actual datum center, with a diameter of the bonus. In this case, the Y axis must go through the exact center of the clocking datum, since no MMC is applied there. Why the Answer?: -C- Center True Position Result = Ø 0.1192 “Bonus” on Center Ø 0.1 True Position Tolerance = Ø 0.1 Feature Target Center -B- Center Feature Actual Center 10.0 10.0562 True Position with MMC

  13. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 A B C M Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=13 B 10.0 True Position with MMC

  14. Calypso Characteristic: Calypso Report: True Position with MMC

  15. Why the Answer?: When MMC is applied to the clocking datum and not the centering datum, the origin of the coordinate system cannot change. The rotation, however, can change, so the Y axis passes through the bonus circle around the clocking datum’s center. Since Rotation does not bring the feature center closer to the target center, the answer is the same as if no MMC is applied at all. “Bonus” on Clocking Ø 0.1 -C- Center Y True Position Result = Ø 0.2 True Position Tolerance = Ø 0.1 Feature Target Center -B- Center X Feature Actual Center 10.0 10.1 True Position with MMC

  16. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 A B M C M Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=1 B 10.0 True Position with MMC

  17. Calypso Characteristic: Calypso Report: True Position with MMC

  18. Why the Answer?: When MMC is applied to the Centering Datum and the Clocking Datum, the Coordinate system is free to rotate and translate within the constraints of the bonus circles centered on both datums. The Coordinate system can move half of the datum bonus amount toward the feature center. “Bonus” on Clocking Ø 0.1 -C- Center Y True Position Result = Ø 0.1 “Bonus” on Center Ø 0.1 True Position Tolerance = Ø 0.1 Feature Target Center -B- Center X Feature Actual Center 10.0 10.05 True Position with MMC

  19. Feature Actuals and True Position Callout: -A- X=0 Y=10 D=1 C Ø 0.1 M A B M C M Ø 1.0 ± 0.1 typ 3 places X=0 Y=0 D=1 X=10.1 Y=0 D=1 B 10.0 True Position with MMC

  20. Calypso Characteristic: Calypso Report: True Position with MMC

  21. Why the Answer?: When MMC is applied to the Feature and Datums, all mobility of the Coordinate system discussed in previous slides apply, plus there is a larger overall tolerance zone for the feature. Calypso will “bestfit” until either the true position result is within tolerance, or the result cannot be improved further. “Bonus” on Clocking Ø 0.1 -C- Center Y True Position Result = Ø 0.150 “Bonus” on Center Ø 0.1 True Position Tolerance with Bonus = Ø 0.2 Feature Target Center -B- Center X Feature Actual Center 10.0 10.075 True Position with MMC

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