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  1. fteixeira

    Flatness at MMC?

    Hello all, I received an answer from Paul Drake, the editor of the "Dimensioning and Tolerancing Handbook" regarding the discrepenacy in his book (see OP). Paul refered me to section 5.8.4 of the book, where flatness for a width-type feature is discussed. It is clearly stated in the book that...
  2. fteixeira

    Flatness at MMC?

    KENAT, "Dimensioning and Tolerancing Handbook" by Paul Drake is from 1999, ISBN-0070181314. Any new proposed updates to the standard are obviously not included. I wondering if such flatness usage was ever allowed in the 1973 standard? By the way, I do have a copy of the Y14.5M-1994...
  3. fteixeira

    Flatness at MMC?

    Guys, thanks for all the comments. I agree that the Drake book is clearly wrong. The erroneous flatness callout should have been a straightness control. The previously mentioned table 5-15 is clearly also wrong. After digging deeper, I found figure 3-16 in Krulikowski's book that clearly...
  4. fteixeira

    Flatness at MMC?

    powerhound: yes, i am looking at a flatness callout. My eyes aren't great, but they're not that bad! dingy2: The flatness callout is not attached to a surface. It is floating below the thickness dimension/tol, similar to a feature tolerance of position control. On page 5-15 of the book...
  5. fteixeira

    Flatness at MMC?

    Hello everyone, I am new on the eng-tips forums. While I am no expert in applying GD&T, I have taken some courses and use Y14.5M standard and other handbooks as reference. I have recently picked up the "Dimensioning and Tolerancing Handbook" by Paul Drake... highly recommended! I am...

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