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  1. GDTGUY

    Setting up datums on a part shaped as a parallelogram

    Yep! Datum planes (theoretical) are always mutually perpendicular, but datum features (real) may not always be mutually perpendicular. See ASME Y14.5M-1994, paragraph 4.4.1.1, "Parts With Inclined Datum Features" for instruction on how it's done. GDT_GUY
  2. GDTGUY

    Straightness vs flatness

    "The gap is set to material thickness at MMC and the tolerance for “flatness” added." Flatness is not additive to the limits of size, it's a refinement. If your "U" shaped block is intended as a flatness check gage, then it's not set up to check the flatness requirement. A part that came in...
  3. GDTGUY

    New ASME Y14.5M?

    On Monday of this week, ASME posted a public review draft to revise and redesignate current ANS: ASME Y14.5 - 20XX, Dimensioning and Tolerancing. Public review period for this new draft ends on 1/22/2008. A copy of the review draft may be purchased from ASME at a cost of $85 (US). Wed link...
  4. GDTGUY

    coaxiality overboard?

    ASME Y14.5M-1994, paragraph 2.7.3 "Relationship Between Individual Features." states the following: "The limits of size do not control the orientation or location relationship between individual features. Features shown perpendicular, coaxial, or symmetrical to each other must be controlled for...
  5. GDTGUY

    Datum Feature Symbol placement

    ASME Y14.5M-1994, paragraph 3.3.2 describes the application of a datum feature symbol in the following acceptable methiods. -- placed on the outline of a feature surface, or on an extension line of the feature outline, clearly separated from the dimension line, when the datum feature is the...
  6. GDTGUY

    Balloon Standards?

    Just a few references: ASME Y14.34, paragraph 3 defines "Find No. or Item Number", but does not describe a face-of-drawing symbol for them in the standard. Y14.100, paragraph D3 also talks about find and item numbers, but gives no requirements for a drawing symbol. Y14.35, paragraph 5.4...
  7. GDTGUY

    Datum Feature Symbol

    The datum feature symbol was changed from the rectangular box containing a letter preceded and followed by a dash to the "suction cup" symbol with the release of ASME Y14.5M-1994. This change in symbols was done toward harmonizing U.S. standard symbols with those used under ISO conventions...
  8. GDTGUY

    brain freeze on positional calculation

    It looks like you did your calculation correctly. This is a typical fixed fastener application. Another way to look at it is the total tolerance budget that is available for the parts based on the specified hole/fastener sizes stated. T(total) = H - F T(total) = 9.58 - 9.525 T(total) =...
  9. GDTGUY

    proper temperature for inspection. where? why?

    Also see ASME B89.6.2-1973 (reaffirmed 2003), "TEMPERATURE AND HUMIDITY ENVIRONMENT FOR DIMENSIONAL MEASUREMENT". This standard has a lot of good information on tempature and humidity compensation in measurements, coefficient of expansion ratios, thermal conductivity, etc. All good things that...
  10. GDTGUY

    Multi-Sheet Drawings

    ASME Y14.1 states the following for continuation sheets on an engineering drawing: 5.6 Continuation Sheets Continuation sheets are used for second and subsequent sheets of a multiple sheet drawing. For continuation sheet title blocks see Figs. 6 and 7. As an option, title blocks shown in Figs...
  11. GDTGUY

    How does Y14.5 call out through holes

    ASME Y14.5M-1994, paragraph 1.4(m) states; "Unless otherwise specified, all geometric tolerances apply for full depth, length, and width of the feature." Unless you've indicated an exception to this fundamental rule on your drawing, the tolerance applies to the entire length of the hole. GDTGUY
  12. GDTGUY

    What is the Best Stack Up Analysis Book Out There??

    Geometric Tolerancing Stacks and Analysis Workbook, includes solutions-$46.00 ea or Geometric Tolerancing Applications with Stacks Workbook, includes solutions - $46.00 ea Both are by Al Neuman, Technical Consultants Inc. and may be purchased at: http://www.geotol.com/textmaterials.htm GDT_GUY
  13. GDTGUY

    ASME Rivet Callout?

    The only standardized method In know of for indicating rivets on and engineering drawing is NAS523, 'Fastener Codes'. This National Aerospace Standard defines a system of using coded symbols on the drawing to indicate fastener type, size,grip length, head location, etc. GDT_GUY
  14. GDTGUY

    help in defining a surface

    If you read the drawing literally as shown, the .3250 +/-.0005 dimension comes from an axis at the center of the part, but it doesn't really say it's the axis from datum feature A. Additionally, the perpendicularity reference back to datum B is not appropriate since it is a secondary datum...
  15. GDTGUY

    Looking for a GD&T trainer in the Atlanta area

    Per the ASME web site: Engineers Edge Training Consultants Contact: Kelly Bramble, Trainer@engineersedge.com Tel. 770.266.6915 510 Crosslane Rd. Monroe, Georgia 30356 Website: http://www.engineersedge.com/cgi-local/asme_engedge.cgi.
  16. GDTGUY

    Drawing text upper case vs. lower case?

    ASME Y14.5-1994, para 1.1.5 just provides guidance to the reader in understanding where notes are intended to go on the drawing verses notes that are intended as explanatory only when reading the Y14.5 standard. It does not standardize lettering case use for engineering drawings. ASME...
  17. GDTGUY

    Flatness Call out

    The flatness and straightness specification is being applied on a "per unit" basis. The flatness and straightness can vary 1,5mm over any 2m area. The concept is illustrated in ASME Y14.5M-1994, paragraph 6.4.1.1.4 for straightness and 6.4.2.1.1 for flatness. The "/" between the values is...
  18. GDTGUY

    Profile of a Surface to define a hole pattern?

    ASME Y14.5M-1994 is flexible enough that you can specify all of your dimensions as basic and apply the tolerance requirements as a profile tolerance for both the outer profile and holes. The profile tolerance zone would be applied to the basic definition of all the features (either bilaterally...
  19. GDTGUY

    Specification Practices...

    U.S. industry standard ASME Y14.2M-1992, "Line Conventions and Lettering" does not make any mention of underlining text on an engineering drawing. However, ASME Y14.5M-1994. "Dimensioning and Tolerancing", paragraph 1.7.9 states that, for a dimension not to scale, the defining dimension is to...
  20. GDTGUY

    "Parts List" vs. "Bill of Materials"

    I don't think ASME Y14.34 implies anything either; it says it straight out in the definitions. The full definition for the term 'Parts List' taken straight from ASME Y14.34 reads as follows: parts list (PL): a tabulation of all parts and bulk matenals, except those materials that support a...

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