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Type: Posts; User: Belanger

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    You would benefit from a good introductory course...

    You would benefit from a good introductory course to GD&T (check out the various options from Engineers Edge, even the online training). But to answer your general questions, datum features are the...
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    Kelly -- I'm curious about why you think it looks...

    Kelly -- I'm curious about why you think it looks like an ISO drawing. (Other than the fact that position is used on a surface.)
    I ask because the ISO drawings I've seen usually have the leader line...
  3. Yes, your thinking about the datums'...

    Yes, your thinking about the datums' interrelationship to each other is the reason that A is important. Realize that while we say that datums A, B, and C are all mutually perpendicular, in reality...
  4. This could also be resolved by simply having the...

    This could also be resolved by simply having the same position feature control frame tagged to the horizontal span, similar to Figure 7-34 of the standard. (I would also add the word BOUNDARY, but...
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    Figure 4-3 (f) in the Y14.5 standard shows an...

    Figure 4-3 (f) in the Y14.5 standard shows an example of a single slot-type feature called out as a single datum. So it might be just like that, except that you want to add a "4X" in front. (Hoping...
  6. Kelly, I would say that datum C would not be...

    Kelly, I would say that datum C would not be established from the four holes themselves. Datum C would be established from the maximum material boundary of the four holes. A fine point of distinction...
  7. If all holes are the same size and of the same...

    If all holes are the same size and of the same importance, I wouldn't even use just one hole as the datum feature. Just make the 4-hole pattern create datum C. This can be done by dumping the...
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    And make sure they really want the datum to be...

    And make sure they really want the datum to be labeled like that -- it is implying that the center plane of the 5.750 span is the true datum. That's fine, but I ask because often on parts like this...
  9. Thread: GD&T Help

    by Belanger
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    The extra tolerance from the datums (not really...

    The extra tolerance from the datums (not really "bonus," but "datum shift") can't be added into the tolerance you're trying to measure. This is because they act in different directions. So it's a...
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    Not sure how you would do TIR of a hex shape. ...

    Not sure how you would do TIR of a hex shape. But if you're thinking GD&T, my first inkling would be profile of a surface.
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    Kelly seems to be on to something ... I too...

    Kelly seems to be on to something ... I too suspect that this is not meant to be an ASME Y14.5 drawing, but rather the ISO system. Two clues make me think that:
    -- the print uses commas rather...
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    From the standard ASME Y14.5-2009, paragraph 2.5:...

    From the standard ASME Y14.5-2009, paragraph 2.5: "MIN or MAX is placed after a dimension where other elements of the design definitely determine the other unspecified limit. Features, such as the...
  13. Yes, it's valid. And yes, by doing that, the...

    Yes, it's valid. And yes, by doing that, the axis of the small hole is being held parallel the the primary datum A.
    All the datums are doing is establishing a "reference frame," or a coordinate...
  14. Hmm..... homework?

    Hmm..... homework?
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    It means that the given GD&T number on the print...

    It means that the given GD&T number on the print would be shown as a zero. But due to the modifier (most likely the circled M, called MMC, but it could also be the circled L, called LMC), the GD&T...
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    Believe it or not, what you've heard from the...

    Believe it or not, what you've heard from the Corporate Eng folks is correct, and it's (usually) best for both you and them and the customer. Think about it: If the print says "drill 3/4 inch...
  17. First, a minor terminology thing... the (M) that...

    First, a minor terminology thing... the (M) that comes after a datum letter doesn't create a bonus tolerance. It does allow for extra tolerance in a way, but the proper name for it is shift...
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    A radius such as that is technically not a...

    A radius such as that is technically not a "feature of size," so the only option may be datum targets.
  19. That is just Figure 5-37 from ASME Y14.5M-1994. ...

    That is just Figure 5-37 from ASME Y14.5M-1994. (Same as Fig. 7-24 in ASME Y14.5-2009.)
  20. Not sure what you mean by "multiple frameworks." ...

    Not sure what you mean by "multiple frameworks." If a drawing has multiple datum reference frames, then it has multiple frameworks, meaning those specific GD&T callouts that refer to certain datums...
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    I think my first sentence was backwards... I...

    I think my first sentence was backwards... I should've said: "Maybe they want to hold that profile so tight because if the diameter of the actual hole is toward the smallest, the reducing...
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    Maybe they want to hold that profile so tight...

    Maybe they want to hold that profile so tight because if the diameter of the actual hole is toward the largest, the expanding circumference of that circle "eats" into the area of the flat. If the...
  23. There are basically four qualities that might be...

    There are basically four qualities that might be controlled. Tell us which of these are important to the function, and whether they are to be held to the same tolerance. (Or perhaps one of these...
  24. Whether or not you use GD&T, every print must...

    Whether or not you use GD&T, every print must address the same four things (dimensionally speaking):
    form
    orientation
    location
    size

    If your or your colleague thinks that all of these things...
  25. I'm just joining in here, so let me go back to...

    I'm just joining in here, so let me go back to the beginning...

    There is nothing on that snapshot to indicate whether they are studs or holes. (You mention some "old-school" rule, but I don't...
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