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  • Users: rimag
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  1. rimag

    Recommanded tolerance for datum features

    You see, I am not used working with inches :). I agree, and my point was just that, normally obtaining a tight flatness is not a big deal.
  2. rimag

    Recommanded tolerance for datum features

    There might be a difference between ASME and ISO here how datums are associated and established from datum features, but for ISO atleast, the form/location/orientation of a datum feature is important as it will affect the measuring uncertainty of the tolerance zone of features referencing the...
  3. rimag

    ISO - Flatness CZ of Offset Features

    Mech1595, I agree with 3Ddave as it being a defect, incomplete drawing. Looking at your figure, first of all the flatness requirement is only valid for the lower surface. The CZ means nothing unless there is a "2 x" notation or multiple leaders pointing to other surfaces for the flatness...
  4. rimag

    datum system

    Hi, In ISO, a complete datum system that locks all six degrees of freedom consist of a plane (3 points), a line (2 points, and a point. Much like how an alignment would be in a CMM with spatial alignment, planar alignment and origin. In your first ISO example, there is only primary and...
  5. rimag

    GD&T - Position of bore relative to stock bar hex

    Hi James, I would keep datum "A" as the center line of the bore and tolerance the the outer diameter as UF Ø39 with a position tolerance with respect to "A". I have not done this my self, but for a hex I have seen the following approach being used; 3x 36 h11 with a position tolerance at MMC...
  6. rimag

    ISO 2768-1 TOLERANCE FOR DIMENSIONS BIGGER THAN 4000 mm

    ISO 2768-1 is still valid, 2768-2 is withdrawn but still allowed to use (although ISO will not update it anymore). It is likely ISO 2768-1 will remain for a while longer due to the wide spread use at least in European industry. As mentioned, a newer standard for general tolerancing is ISO...
  7. rimag

    Datum Reference

    ISO 5459:2011, Annex D.3 reminds us that is a former practice to indicate a common datum established from a group of features with and indication of single datum. I would say that this is still very common, I see it often in both older and more recent drawings. As already mentioned above, ISO...
  8. rimag

    Self-referencing or not

    ISO defines it in ISO 5459:2011 as a point, straight line or plane (or helix) from which the location and orientation of features can be defined. A fully defined datum system locking all 6 DoF would consist of a set of situation features; normally a plane - a line and a point, derived from the...
  9. rimag

    Self-referencing or not

    Thank you for clarifying. Overseeing the primary datum had me off there. I am new to this forum and hoping to learn more about ASME and ISO similarities and differences.
  10. rimag

    Self-referencing or not

    I see now, that primary datum was C, not D my mistake. @Burunduk, I agree. Still, I am yet to see an example as such in ISO GPS standards. The associated feature for the cylinder would be min circumscribed per ISO default rule and the situation feature being a straight line - axis of the...
  11. rimag

    Self-referencing or not

    Hi, I am working exclusively with ISO, but have seen examples from ASME Y14.5 in other threads on Calypso forum where they point to figures in Y14.5 that is a similar case where a datum is self-referencing. To me, its self referencing and not something that would be supported in ISO atleast. I...

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