Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  1. V

    Why flatness tolerance associated with a FOS must be less than the size tolerance?

    As ghostdigital said, flatness specified to a surface is a refinement of the surface and it must be less than the size tolerance. The only exception I can think of is that with a long plate, I can apply a flatness to the thickness dimension to override rule #1 and give it a bigger flatness...
  2. V

    Why flatness tolerance associated with a FOS must be less than the size tolerance?

    Hi Garland23, thank you for your answer! Your answer has made my thinking smooth again.
  3. V

    Why flatness tolerance associated with a FOS must be less than the size tolerance?

    In my understanding, when a flatness tolerance is associated with a FOS, the Rule #1 is overridden and perfect form at MMC is removed. So, flatness tolerance associated with a FOS can be greater than the size tolerance. However, ASME Y14.5-2009 specified in section 5.4.2 that, with flatness of...

Part and Inventory Search