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  1. CheckerRon

    Who accepts final responsability for a drawing; the Certified Drafter or the Engineer that checks it

    A second pair if educated eyes is invaluable in accuracy of the final engineering product. Many companies now have deleted the seperate checking function, relying on CAD accuracy and expecting the drawing generator to review their own work before filing and submitting it. IF you find a mistake...
  2. CheckerRon

    Balloon quantity standard ??

    As an old job shopper, I've seen several different methods of defining quantities adjacent to balloons. What I like best is a well defined company DRM which unifies the method of qty definition on assembly drawings; noting that the BOM is the ultimate authority, and assy dwgs must agree with it...
  3. CheckerRon

    Bent wire shape: Profile of a line ?

    I love GD&T as much as anyone, but in this case, I would treat that wire the same way I would treat a single line bent pipe spool, and forget the GDT altogether. Not saying you couldn't come up with a method, but since it is coated anyway, why bother?
  4. CheckerRon

    GD&T of a counterbored slot

    I've done this before and there is a couple ways. You can dimension the slot and the counterbore slot to the same datums each having it's own FCF and maybe a relaxed tolerance on the counterbore, or you can positional tolerance the slot a per the standard and give it a datum, say D. then...
  5. CheckerRon

    Surface Roughness General Coverage Specification

    Since KENAT is checker and I am a checker, can we trust the comments of "CheckerHater"? [wink]. Nice to be back. A former client dragged this old job shopper out of retirement and brought him back to check again, for a while. We may be a dying breed, but not just yet.
  6. CheckerRon

    Correct placement of drawing notes as per latest ASME standard

    Seems like company preference is the bottom line. The places I have been at recently like to put the notes in the upper right, sufficiently below the Revision Block, in order to make more room for drawing space. This works good for detail part drawings. For assemblies, is is better to have them...
  7. CheckerRon

    Surface Roughness General Coverage Specification

    As Jim Sykes says, don't confuse Roughness Max and Roughness average Max. ASME Y14.36 para 4.3 "Roughness Average (Ra)" states "The principle parameter specified for roughness average, Ra, defined in ASME B46.1. It is the value shown in position "a" of the surface texture symbol (i.e. directly...
  8. CheckerRon

    ProE- Family Table Question

    I am not a big Pro/E guy, but my officemate says: Sounds like doing family tables to large assemblies is going in the wrong direction. You should try looking at simplified reps to create your individual subassemblies as needed. That will allow you to turn parts on and off.
  9. CheckerRon

    Features Of Size Question

    Thanks, John-Paul. In kicking these ideas around with my colleagues, we came to the same conclusion as you, that the first two examples are really not features of size. Para 1.3.17 of 1994 ed. seems to say that, and the expanded explanations in 1.3.32 of 2009 clarify it for us.
  10. CheckerRon

    Features Of Size Question

    Using the new word fcsuper just taught me, are the 3 dimension A's just tautologies?
  11. CheckerRon

    Features Of Size Question

    Let me throw another monkey wrench into the works. What if I need to make dimension A width a symmetry datum for other symmetrical features, but the the 2 sides of dimension A are not directly oppoded so that I can put a calipers or mic across them. Isn't it still a feature od size? Bottom...
  12. CheckerRon

    Features Of Size Question

    Belanger, your last post re: directly toleranced dimensions raises a question in my mind on SeasonLee's sample above. Wouldn't you say that dimension A is a directly toleranced dimension in all three examples, directly opposed or not? I can envision fitting dimension A on all 3 examples into a...
  13. CheckerRon

    Nonmandatory Appendices and Surface Roughness

    B46.1 Appendix B1 Specification says this: "(a) Surface texture should not be controlled on a drawing or specification unless such control is essential to the functional performance or appearance of the product. Unnecessary restrictions may increase production costs and mitigate the emphasis on...
  14. CheckerRon

    Nonmandatory Appendices and Surface Roughness

    The term "OR BETTER" is clearly redundant, as is MAX. It has been eluded to above, most clearly by dgallup, that a stated roughness average (Ra) is: (per Figure 5 of ASME Y14.36)"The specified roughness average shall indicate the maximum value and any lesser value shall be acceptable." The...
  15. CheckerRon

    stress calc's for threads

    ditto on ASME B1.1. Also most thread calcs for tensile or shear use the thread root area. Most conservatively based on min minor of external thread. www.boltplanet.com is a good source for such thread data
  16. CheckerRon

    KAPL Document

    Wow! There is a acronyn out of the past---KAPL. I worked for a sub-contractor to KAPL in the late 60's, early 70's, designing and building Control Rod Drive Mechanisms for them and the NAVY. As I recall, we used our own internal manufacturing practices, but assembly tolerances were dictated...
  17. CheckerRon

    STK

    I have had to recently defend the use of "STOCK" or "STK on tooling parts where specified thicknesses are unmachined stock material thicknesses (IAW 1.4a). It states that the tolerances are per the material spec, and thus not to be inspected per drawing "block" tolerances. This is because...
  18. CheckerRon

    All over?

    I hear and understand, Ken. Persevere! ALL OVER symbol on a fillet radius?! That's cute, but somebody will probably try it.
  19. CheckerRon

    All over?

    fcsuper: Those words "or other specification" in 3.3.25 of Y14.5-2009 will cause questions, controversy, and disagreements for years, until the next revision. Just like the deletion of the word "profile" did in para 3.3.18 of Y14.5M 1994 did for the "all around" symbol. My buddy KENAT: Can...
  20. CheckerRon

    Tolerancing style

    There ye be, HG (Morgan). I agree with you completely

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