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  1. Kedu

    When a surface flatness has been specified, the DMP flatness is inherently also controlled (ASME)?

    Do you find these statements ambiguous or incorrect? When a surface flatness has been specified, the DMP flatness is inherently also controlled, but the converse is not true. In other words, when a DMP Flatness is specified, the surface does not have to be flat at all, although it must now be...
  2. Kedu

    Nominal versus mean on MBD

    MBD environment and settings Should we model at "the nominal" or at "the mean"? Looks like design-inspection preference is "the nominal" and manufacturing is "the mean". Creating a derivative for manufacturing looks like it is NOT a GREAT solution (could be an OKAY one however) due to the...
  3. Kedu

    MBD and what means a good 3D model

    Per a discussion on a different platform, I would like to ask the members of this group the following questions: What means “Engineering Check Processes” in the MBD world (otherwise stated what checkers are looking for when a MBD model is verified)? What tools checkers are using to verify the...
  4. Kedu

    PCB with multiple identical instances - ISO drawing-

    I am working on a part similar to the one shown with model based definition geometrical controls. The part’s product definition should be based on the ISO GPS (8015, 1101 and 14405-1) The center hole is considered as a datum feature for the 6 small holes. I have 24 of those instances (24 inside...
  5. Kedu

    Size versus UOS default specification

    If a feature of size tolerance is large enough, can it vary in form to a degree such that the angle between surfaces can be larger than an "UNLESS OTHERWISE SPECIFIED" block angle tolerance allows…? In addition to Rule #1, can/must form also be limited by block angle tolerance? Another way I've...
  6. Kedu

    ISO withdrawn standards

    How to deal with withdrawn ISO standards still shown on drawings? What is your best recommendation? How your company is doing it? Nevertheless, withdrawn standards can still be used within an industry, community or by a government, and this is often what happens when there are no replacement...
  7. Kedu

    Dynamic profile Toleranze Zone modifier

    Straight forward question: ASME Y14.5-2018 In order to correcly use dynamic modifier with profile, do we need to have the radius basic or is okay "as-is" (plus / minus)? ISO Same question for the OZ modifier.
  8. Kedu

    How you read this drawing?

    I've always been under the impression that if the drawing creator missplaced the datum feature symbol for a cylindrical surface, the datum is still the axis (yes, even the datum feature symbol is not aligned with the size dimensions, AGAIN, on a cylindrical feature and not on a width/ tab)...
  9. Kedu

    Symetry versus derived median plane flatness

    From a likedin discussion "Conceptually, symmetry is extremely similar to DMP flatness, which is why we're discussing it- just in reference to a datum. If DMP flatness is a form tolerance - and it is - symmetry is also a form tolerance" Do you guys agree with the statement above? Sometimes...
  10. Kedu

    Flatness (theory)

    Are there any definitive statements from Y14.5 (1994, 2009, 2018 or any version) to reflect that flatness shall be applied to a (nominally) planar surface only? Or, in other words, what prevents the application of flatness to a curve?
  11. Kedu

    Incomplete or profile general note applicable

    What is your opinion about this drawing? Are datum feature B and datum feature C fully defined or are incomplete? Otherwise stated, is profile general note (profile|3|A|B|C|) applicable to "B" and "C" datum features?
  12. Kedu

    Maximum possible flatness error ISO versus ASME

    Flatness of the sides shown with red arrows: the combined effect of the two requirements shown (size 28±0.1 and perpendicularity 0.4|A|) What is the maximum possible flatness error in those 2 cases: 1.) ISO GPS 2.) ASME Y14.5 (with no rule#1 in place) Is it different or it's the same in...
  13. Kedu

    Parallelism

    For the part shown use ASME Y14.5-2009 and determine what would be the maximum envelope for this part? Will the parallelism of 0.003 (black option) versus 0.010 (red option) make any difference in calculation the maximum envelope? (datum feature A is the same for both options = the bottom...
  14. Kedu

    Free state modifier -in and out of the FCF's-

    "Those Who Do Not Learn History Are Doomed To Repeat It." writer and philosopher George Santayana Just looking in ASME Y14.5-2018 fig 8-13 I have noticed that F symbol is gone from the FCF. Going back in history here is some summary: ASME Y14.5-2018: F OUT of FCF (No free state modifier in...
  15. Kedu

    Slot / snap-ring dimension

    ASME Y14.5-2009 If a slot (groove) width is dimensioned with a direct toleranced dimension (10 mm ± 1) and one side of such said slot is profiled (located) from a datum reference frame (profile xxx |A|B|C|), does the xxx value for the profile should be smaller than 2mm (total size for the width...
  16. Kedu

    Capability Study - Virtual Condition Boundary method

    Does anyone know (or maybe has an article to post) on how to do a capability study on position tolerance at MMC callout using "Virtual Condition" boundary approach? As far as I remember, and read, this method has been developed (and shown) by prof. Don Day few years ago. Few questions came in...
  17. Kedu

    Fig 6-30/ ASME 2018

    Is Ø31.6 - 31.8 outside diameter controlled to profile within 0.5 to |A|B| and shown circular runout (0.1|C|) it's only refinement? How do I treat the circular runout?
  18. Kedu

    Question overwriting default UOS

    Is the sentence shown below correct? Should I understand that the holes are located by both (position and default profile) and the more stringent one takes precedence?? What the holes definition has to do with the unless otherwise specified note? I do not know I understand that. Thanks...
  19. Kedu

    LP and GX for cylindrical feature ISO GPS

    Folks: Do you think LP and GX combo is valid for the same cylindrical feature? Is it allowed based on ISO GPS set of standards? What would be your opinion? Thank you for any input in this matter.
  20. Kedu

    ISO Equivalency

    I'm trying to grasp ISO concepts and I would like to clarify some on my (most likely) misunderstandings: A hole is dimensioned for size and location: Ø40 ± 0.1 E (envelope requirement) pos Ø0.05 (circle X) to A primary, B secondary and C tertiary is the above scheme equivalent with Ø40 ±...

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