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ASME Y14.5 Proposal on Feature of Size

ASME Y14.5 Proposal on Feature of Size. Topics. How to ensure minimum size is met on a feature of size where portions (or in some cases all) of the features are not opposed. Clarify the definition of “size” in Y14.5. Understand the definition of “size” from Y14.5.1

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ASME Y14.5 Proposal on Feature of Size

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  1. ASME Y14.5 Proposal on Feature of Size ASME Y14.5 presentation by Alex Krulikowski May 2005

  2. Topics • How to ensure minimum size is met on a feature of size where portions (or in some cases all) of the features are not opposed. • Clarify the definition of “size” in Y14.5. • Understand the definition of “size” from Y14.5.1 • Using the size definition from Y14.5.1 to clarify what size means in Y14.5 • Proposal to change Y14.5 to clarify: actual local size, opposed, size, and feature of size ASME Y14.5 presentation by Alex Krulikowski May 2005

  3. Definition of “feature of size” from Y14.5 1.3.17 Feature of Size. One cylindrical or spherical surface, or set of two opposed elements or opposed parallel surfaces, associated with a size dimension. ASME Y14.5 presentation by Alex Krulikowski May 2005

  4. Dimensioning Concepts Applied to a Feature or a Feature of Size ASME Y14.5 presentation by Alex Krulikowski May 2005

  5. Definition of “Opposite” from the Oxford English Dictionary ASME Y14.5 presentation by Alex Krulikowski May 2005

  6. Example of Fully Opposed Surfaces in Facing and Opposite Directions Tab Tab Slot A B C D E F Facing _________ Surfaces Surfaces from each other Considered Facing A & B Away Opposed Opposed B & C Towards B & D Same Direction Same C & D Away Opposed E & F Towards Opposed ASME Y14.5 presentation by Alex Krulikowski May 2005

  7. Examples of Fully Opposed Line Elements Facing and Opposite Directions ASME Y14.5 presentation by Alex Krulikowski May 2005

  8. 1. 2. A A B B Surfaces A and B are Surfaces A and B are different lengths different shapes 3. 4. A A B B Surfaces A and B are offset Surfaces A and B contain gaps and interruptions Examples of Partially Opposed Features ASME Y14.5 presentation by Alex Krulikowski May 2005

  9. A 1. 2. A Distance A contains line elements of different lengths Distance A contains offset line elements Examples of Partially Opposed Line Elements ASME Y14.5 presentation by Alex Krulikowski May 2005

  10. Examples of Cylindrical Shapes with Truncated Ends ASME Y14.5 presentation by Alex Krulikowski May 2005

  11. Examples of Interrupted Features of Size ASME Y14.5 presentation by Alex Krulikowski May 2005

  12. Examples of Partially Opposed from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  13. Examples of Partially Opposed from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  14. Examples of Partially Opposed from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  15. Examples of Partially Opposed from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  16. Examples of Partially Opposed • There are at least 18 examples of partially opposed features of size in Y14.5. • There are numerous cases of partially opposed features of size in industry. • Partially opposed features of size cause problems when determining the LMC size in the non-opposed areas. ASME Y14.5 presentation by Alex Krulikowski May 2005

  17. Definition of “feature of size” from Y14.5 1.3.17 Feature of Size. One cylindrical or spherical surface, or set of two opposed elements or opposed parallel surfaces, associated with a size dimension. ASME Y14.5 presentation by Alex Krulikowski May 2005

  18. In Y14.5 the definition for size is limited. Definition of “Size” from Y14.5 5-1 Assumes Rule #1 is in effect ASME Y14.5 presentation by Alex Krulikowski May 2005

  19. Actual local size Definition of “Size” from Y14.5 Problems with “Actual Local Size” • The direction of measurement is not described, resulting in many answers possible for the value. 5-1 • It describes a “two-point” measurement • Only works with “opposed points” ASME Y14.5 presentation by Alex Krulikowski May 2005

  20. Definition of “Size” from Y14.5 5-1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  21. Definition of “Size” from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  22. Definition of “Size” from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  23. However, Y14.5 does not define how size is interpreted when Rule #1 is overridden Definition of “Size” from Y14.5 ASME Y14.5 presentation by Alex Krulikowski May 2005

  24. Y14.5 invokes Y14.5.1 which defines how size is interpreted both with and without Rule #1. Y14.5 Invokes Y14.5.1 5-1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  25. Definition of “Size” from Y14.5.1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  26. MMC LMC SPINE Definition of “Size” from Y14.5.1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  27. Definition of “Size” from Y14.5.1 Spine Types • A 0-dimensional spine is a point, and applies to spherical features. • A 1-dimensional spine is a simple (non-intersecting curve in space, and applies to cylindrical features. • A 2-dimensional spine is a simple (non-intersecting surface, and applies to parallel plane features. A ASME Y14.5 presentation by Alex Krulikowski May 2005

  28. Definition of “Size” from Y14.5.1 A ASME Y14.5 presentation by Alex Krulikowski May 2005

  29. Definition of “Size” from Y14.5.1 A ASME Y14.5 presentation by Alex Krulikowski May 2005

  30. When perfect form at MMC is required Definition of “Size” from Y14.5.1 A ASME Y14.5 presentation by Alex Krulikowski May 2005

  31. When perfect form at MMC is required Definition of “Size” from Y14.5.1 A ASME Y14.5 presentation by Alex Krulikowski May 2005

  32. Size and Partially Opposed Features In Y14.5 In Y14.5.1 • Does not require fully opposed features. • Does not use the term actual local size. Uses two half space boundaries to define the size tolerance zone. • Explanation for use with max or min size definition • Works with or without Rule #1. • Actual local size requires fully opposed surfaces. • Actual local size is defined as a two-point measurement. There is no direction for the measurement defined. Should actual local size be defined as a tolerance zone? • Actual local size is only explained as a method for checking a minimum distance. • How is a max size checked when Rule #1 is overridden as in figure 6-3? ASME Y14.5 presentation by Alex Krulikowski May 2005

  33. Size according to Y14.5 The 64.6 – 65.0 diameter is considered a feature of size. Using the Y14.5 definition of size, it is impossible to measure the actual local size of the diameter. ASME Y14.5 presentation by Alex Krulikowski May 2005

  34. Now lets look at how the same size dimension would be interpreted using Y14.5.1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  35. Size according to Y14.5.1 The 64.6 – 65.0 diameter is considered a feature of size. Using the Y14.5.1 definition of size, the size tolerance zone of the 64.6-65.0 diameter is defined by two half space boundaries. The boundaries are established by two balls: The MMC limit is defined by a ball equal to the MMC size. The LMC limit is defined by a ball equal to the LMC limit. The balls are moved along appropriate spines to define the tolerance zone. ASME Y14.5 presentation by Alex Krulikowski May 2005

  36. Examples of Size Using Y14.5.1 Drawing Meaning 10.6 MMC boundary 10.6 10.0 MMC ball LMC ball No difficulty measuring the portion of the feature that does not have opposed points ASME Y14.5 presentation by Alex Krulikowski May 2005

  37. Examples of Size Using Y14.5.1 Drawing Meaning 10.6 MMC boundary 10.6 10.0 MMC ball LMC ball No difficulty measuring the portion of the feature that does not have opposed points ASME Y14.5 presentation by Alex Krulikowski May 2005

  38. Recommendations Proposed Text Text in Y14.5M-1994 1.3.24 Size, Actual. The general term for the size of a feature. See ASME Y14.5.1 paragraphs 2.3.1 and 2.3.2 for an explanation of variations in size. 5-1 Text in Y14.5M-1994 Proposed Text Delete paragraph 1.3.25 and replace all instances of Actual local size with Actual Size. (11 places in text and 4 places in figures) ASME Y14.5 presentation by Alex Krulikowski May 2005

  39. Recommendations Proposed Text Text in Y14.5M-1994 2.7 LIMITS OF SIZE Unless otherwise specified (by specification of a straightness control applied to a size dimension, or a note as described in paragraph 2.7.2), the limits of size prescribe the extent within which variations of geometric form, as well as size are allowed.This control applies solely to individual features of size as defined in para. 1.3.17. 5-1 ASME Y14.5 presentation by Alex Krulikowski May 2005

  40. Recommendations • Show the MMC and LMC balls located along spines in several examples • Add a paragraph and examples to explain “opposed” • Add a paragraph and examples of features of size with partially opposed features. ASME Y14.5 presentation by Alex Krulikowski May 2005

  41. The end ASME Y14.5 presentation by Alex Krulikowski May 2005

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