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  1. JNieman

    Can I put Position control on a Radius

    Some standards are defined in design program contracts, some of which may last several decades, leaving 'migration' out of reach.
  2. JNieman

    Can I put Position control on a Radius

    That would be exceptionally difficult and may not actually represent the requirements of the geometry. We make some large rings with radii that are either clearance for mating components, or not-quite-precise locating surfaces for other components. Using profile-of-a-surface has yielded...
  3. JNieman

    MIL-STD-1913

    Doesn't matter. Half the people alleging to manufacture "mil spec" pic rail commercially probably never actually read the MIL-STD-1913 doc anyways.
  4. JNieman

    The meaning of "F3 Break" callout

    Possibly relevant? http://www.thefabricator.com/article/finishing/deburring-a-standard-operation-
  5. JNieman

    Define on Molded part Print Exterior vs the Interior

    Not necessarily a "standards sourced" strategy but what I've used for various finishing aspects is a color-coded drawing. Areas of interest, whether it be for a surface roughness, texture, paint masking, oil-free, wax-covered, etc, will be shown in a shaded view on a drawing sheet, with a note...
  6. JNieman

    Y14.41 approach

    I have experience with a MBD for design and manufacture of precision components and some tooling design, but do not strictly adhere to Y14.41. Some companies I work with use a strictly MBD approach but I do not know how strictly they follow Y14.41. It would mostly appear that they have a...
  7. JNieman

    True position of a hex center?

    For /external/ threads, sure. Easy to control, easy to gage, and almost useless as a functional feature. So not a very smart choice in most applications.
  8. JNieman

    extension of principles - composite profile (non-uniform)

    Sorry, you are absolutely correct. I should stop posting on Monday mornings.
  9. JNieman

    extension of principles - composite profile (non-uniform)

    I would ensure the non-uniform tolerance zone completely engulfs the tolerance zone of the second-half, however, or it'll start some interesting fights, I bet. Say the upper frame values are [ (PoS) | .010 (U) 0 | A | B ] You would then have a .0025 area of uncertainty where the .005 uniform...
  10. JNieman

    True position of a hex center?

    Regarding the use of threaded features as a datum - meh... they make Jo Plugs for a reason. There are occasions where a threaded feature is actually serving more functions than simply fastening, but I absolutely agree that it should be treated as exceptional...
  11. JNieman

    Reference Dimension: Diameter In or Out?

    I never understood why some software defaults to placing it outside the parenthesis when toggling 'reference' dimension states. I especially don't understand it when they -do- correctly place it inside basic dimensions. It seems like they may have very deliberately gone to placing it outside...
  12. JNieman

    Old article --rule#1 expanded to irregular features of size...not sure I agree

    Ah, yes, that narrows the context of the following statements, I misinterpreted. Thanks for the clarification.
  13. JNieman

    Old article --rule#1 expanded to irregular features of size...not sure I agree

    /edit/ sorry, I missed the "not sure I agree" part of the title. Post rewritten /edit/ What specifically do you disagree with? Section 1.3.32.2 does a clear job explaining the definition of an IFoS. 2.7.1 seems to be clear enough to me, that it may include irregular features of size, as well...
  14. JNieman

    fixed fastener calculation

    @3DDave - learned something new today. Never saw Indian notation. And here I thought working between Imperial/Standard and Metric was rough :)
  15. JNieman

    fixed fastener calculation

    Apologies for adding some extra nonstandard shorthand :) John-Paul assumed correctly.
  16. JNieman

    fixed fastener calculation

    I have never seen someone so sensitive to parenthesis. I appreciate this thread. It was good following along and validating my understanding of the FFF.
  17. JNieman

    Stndard length tolerances for plastic profiles

    Do you need it to be +/- 30mm ?
  18. JNieman

    How to specify on drawing a dead center hole on a rectangle

    A rudimentary method I've seen before is to label the overall width as "Dimension A" and the length as "Dimension B" with the location dimensioned to a corner, reading "A/2 +/-.001" and B/2 likewise. Crude. But it works in some situations. Just throwing out "another way" - not necessarily a...
  19. JNieman

    Brain Teaser - nominally symmetrical parts - pass one way, but fail the other?

    When possible, features that serve no other purpose other than ruining symmetry, can be designed into the part. If your hockey puck is a lathe turned part, a simple non-precise groove on the outside diameter can indicate direction, and also be referenced in assembly instructions further down...
  20. JNieman

    tolerance pin, diamond pin

    I'll consider myself fortunate to have never had bad parts due to my incorrect requirements. I'll be using a more appropriate orientation control from now on! Thanks for the helpful tangential clarification. I can think of / find nothing that disagrees with what you say.

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