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  1. marshell

    Dimensioning and Symbology questions on 2009 GDTP senior exam

    When I took 2009 test there was one question regarding specifications. I believe it was asking what spec controls metric limits and fits.
  2. marshell

    Breaking apart a Cots part

    Maybe I did not explain well enough. I have a "purchase" part that has 3 pieces to it. Each of those 3 pieces will be used in 3 different parts/assembles.
  3. marshell

    Breaking apart a Cots part

    I have a COTS (VICD) part that will have the pieces of the part used in different models/drawings. The COTS part consist of 2 weld on flanges, and a clamp that pulls the flanges together. Flange A will be welded onto weldment A, Flange B will be welded onto weldment B, and there will be a higher...
  4. marshell

    Question about controlling bow on extruded profile

    Straightness of a surface still has to meet perfect form at MMC, so that may not solve the issue. Possibly dimensioning the overall height and applying the straightness to the center plane, which would allow overriding perfect form at MMC.
  5. marshell

    How Many Datums are Too Many Datums?

    Relying on simultaneous requirements for much of that could simplify the number of datums.
  6. marshell

    Profile on Sheet Metal

    Not trying to tell them how to make the part. I do not care if they uses an industrial strength paper cutter, plasma cutter, laser or waterjet, I am only defining the limits they must stay within on the finished part.
  7. marshell

    Profile on Sheet Metal

    Sorry about that. I meant to show the all around symbol in the picture. The completed TDP drawings will be a hybrid that includes basic views, any +/- dimensions, GD&T, and directs the user to the cad model to query the basic dimensions.
  8. marshell

    Profile on Sheet Metal

    Maybe I have not explained what I am trying to call out and define. I am trying to determine if the callout in the picture I included would be correct in defining the cut path of the sheet metal part. If the view and callout were in the flat pattern it would work, but am wanting to know if the...
  9. marshell

    Profile on Sheet Metal

    If using the "all over" call out on a sheet metal part, is it the "Unless Otherwise Specified" portion of the all over usage that would need to exempt the all over applying to the thickness, and the main faces? Does the sheet metal thickness tolerance, flatness, etc. still default back to the...
  10. marshell

    Profile on Sheet Metal

    I plan on using profile on the cut surfaces of sheet metal parts. Does the all around for the profile apply across the bends, or do I need to specify multiple profiles going from A<-->B, C<-->D, etc. where each call-out goes from bend to bend? If I go from bend to bend, I would create a primary...
  11. marshell

    Why is the MMC modifier used so much more often than the LMC modifier?

    MMC can also allow for rework of a part that may have position errors. Holes, or datum features (depending on where MMC is applied and error occurring) can be machined towards their LMC limit allowing max positional tolerance, that may bring a part back into spec. A part defined cannot be...
  12. marshell

    Lathe center marks

    When specifying the center mark left on the ends of a lathe built part, should it be fully defined via GD&T, or can a simple note allowing a max diameter and max depth be specified? Thanks in advance.
  13. marshell

    Combining Composite and Bidirectional call outs

    Greenmini, My intent is to have the call out along the lines of a composite. I want to allow the hole pattern to float in a large, rectangular zone, but I want to ensure the hole to hole location of the pattern stays tight in a normal circular zone. Basically I am mounting something on a rail...
  14. marshell

    Combining Composite and Bidirectional call outs

    pmarc, So you are proposing something as this? http://files.engineering.com/getfile.aspx?folder=f93d71f7-d60f-4132-9d20-839d08af40bc&file=Composite-Bidirectional_1.JPG It was too early to concentrate too much on my Fritz [thumbsup2]
  15. marshell

    Combining Composite and Bidirectional call outs

    CheckerHater, I am uncomfortable with it also, but it is the closest thing I can think of to achieve the end requirements. Any ideas on a cleaner method would be greatly appreciated.
  16. marshell

    Combining Composite and Bidirectional call outs

    Is it ok to combine a Composite hole location with a Bidirectional call out? I want to allow the PLTZF to have a relatively large X movement, with a smaller Y movement, while at the same time I would like to limit the FRTZH and have it be a diametric control. I could find no examples in Y14.5...
  17. marshell

    Material Conditions on drawings

    When specifying a material on a drawing, is the finished temper to be listed, or is the pre-machined condition listed with the temper\heat treat requirements added in? As an additional question... Do part normally get tested post heat treat, or is certification of time\temperature of the heat...
  18. marshell

    View labeling on multi sheet drawing

    I did come across something in 14.3, section 6.1 that may work, though I do not believe I have seen it in different worlds. It appears it is stating the use of a coordinate system may be used. It states "The coordinate system may be used to indicate view orientation, and to establish the...
  19. marshell

    View labeling on multi sheet drawing

    Thank you all for the input. I have looked through Y14.100, 14.3, the latest Global DRM, and even looked through the GSFC Drawing Standard. Closest thing I found to mentioning it was from the GSFC manual that stated "A view of another view shall not be used, unless necessary for clarification"...
  20. marshell

    View labeling on multi sheet drawing

    Is there a section of any ASME specification that talks about how views on multi sheet drawings should be labeled? I am not referring to cross referencing for things like sections or details, but on complicated drawings where the views may be repeated on subsequent sheets with different features...

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