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Recent content by pylfrm

  1. pylfrm

    ASME Y14.45-2021 is Now Available

    axym, Thank you for your response. It looks like you interpreted my question roughly as intended despite my lack of explanation. I'd be interested to learn more about the organization of the in-person meetings. I didn't find much information on www.asme.org or cstools.asme.org about past or...
  2. pylfrm

    ASME Y14.45-2021 is Now Available

    What did ASME contribute to the development of this new standard? pylfrm
  3. pylfrm

    Single datum axis of a single spool containing 04 bearings made by 04 shafts spline coupled

    Presumably you could measure runout of datum feature D with respect to D-E, where datum feature E is the feature on the left end of the 4th shaft that locates it relative to the right end of the 3rd shaft. Similarly, you should be able to measure runout of datum feature A with respect to A-F...
  4. pylfrm

    Parallelism

    chez311, Your proposal should work with a slight modification: This scheme can be used in either direction, so it should allow a UAME size of (15.040 + max(flatness, parallelism)). A different scheme would probably allow a UAME size of (15.040 + flatness + parallelism). I realize this may...
  5. pylfrm

    Single datum axis of a single spool containing 04 bearings made by 04 shafts spline coupled

    If the runout is actually controlled at the individual part level, what is the purpose of runout tolerances at the assembly level? The difference relates to the datum feature references. ASME Y14.5-2009 is somewhat vague on the subject. ISO goes into more detail in ISO 5459:2011, but it's...
  6. pylfrm

    Single datum axis of a single spool containing 04 bearings made by 04 shafts spline coupled

    giangnguyen92, Can you post an image showing a section view of the spool assembly with the bearing seats and spline connections labeled? Do you intend to treat the spool assembly as a single rigid body for the purpose of these runout tolerances? Is the runout of the assembly significantly...
  7. pylfrm

    Parallelism

    Could you (or anyone else who agrees with the quoted statements) please describe the shape of a part that meets the requirements of flatness, size, and .003 parallelism, but has UAME size of 15.045? Kedu, I am curious: Why do you ask this question? If the UAME size is relevant, why wouldn't...
  8. pylfrm

    Over Molded Inserts - Coolant Manifold

    AFish66, Regarding the metal collar idea, this Spears product brochure may be of interest. They claim a patent. pylfrm
  9. pylfrm

    Confused by using UAME to determine bonus tolerance

    It's never the case. The two definitions describe completely different requirements. They just produce similar answers in some circumstances. Even without the large angular deviation used in your example, the disagreement between the two interpretations can be approximately double the size...
  10. pylfrm

    Confused by using UAME to determine bonus tolerance

    dsmemr, The two explanations of the tolerance are not equivalent. ASME Y14.5-2009 says the surface interpretation (virtual condition boundary) takes precedence. The simple solution is to always use the surface interpretation and forget about the axis interpretation. The two explanations...
  11. pylfrm

    Virtual condition

    3DDave, I don't think violation of the requirement causes any problem for interpretation of the tolerances. I've always assumed that the only purpose of the requirement is to prohibit specification of a redundant tolerance. This was the formatting: ⌀5.0±0.2 THRU ⏤⌀1.0Ⓜ ⌖⌀0.5ⓂABC And this...
  12. pylfrm

    Virtual condition

    All right. I guess we agree that the position tolerance establishes a cylindrical boundary of diameter 4.3 in that case. Now consider a hole specified as follows: ⌀5.0±0.2 THRU ⏤⌀1.0Ⓜ ⌖⌀0.5ⓂABC This scheme violates the following requirement: Would you say the tolerances have undefined...
  13. pylfrm

    Virtual condition

    3DDave, Imagine a hole is specified as follows: ⌀5.0±0.2 THRU ⏤⌀0.1Ⓜ ⌖⌀0.5ⓂABC Interpreting this per ASME Y14.5-2009, would you say the position tolerance establishes a cylindrical boundary of diameter (5.0 - 0.2 - 0.1 - 0.5) = 4.2 which the surface of the hole is not allowed to violate? pylfrm
  14. pylfrm

    Perpendicularity on multiple holes along single axis

    axym, For the modified version of Fig. 4-2, what would you do if you wanted both profile tolerances to be evaluated in the same alignment? Apply SIM REQT notes to the FCFs? Consider a further modification of Fig. 8-16 with |profile|0.2|A| applied to the small upper flat surface...
  15. pylfrm

    Perpendicularity on multiple holes along single axis

    axym, Consider a modified version of ASME Y14.5-2009 Fig. 4-2 where the hole diameter dimension is basic, the position tolerance is not present, a profile tolerance of 0.2 without datum feature references is applied to the hole on the left, and a profile tolerance of 0.3 without datum feature...
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