Recent content by GDTGUY

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

"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...

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...

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...

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...

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...

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...

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) =...

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...

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...

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

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

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

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...

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.