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  1. MQSCI651

    Rule #1 and form thread

    Why not use such kind of gauge which handle cross section is smaller than thread diameters?http://files.engineering.com/getfile.aspx?folder=928b26bb-cdfa-4b4c-b73b-f1e4dcd910c5&file=Wkg_Thrd_Plug_0.jpg
  2. MQSCI651

    circular hole pattern as datum

    In the assembly, when you use that 4 holes pattern to locate the part, it is the case. Otherwise, when you use OD to locate the part, it is not the case.
  3. MQSCI651

    circular hole pattern as datum

    What manufacturing sequence does this FCF suggest in this drawing?
  4. MQSCI651

    circular hole pattern as datum

    In my opinion, powerhound was right. Because of the FCF shows only one datum feature --- A, using perpendicularity makes more sense. On the other hand, the distances among those holes should be specified with certain tolerances instead of basic dimensions, unless you define the center hole as a...
  5. MQSCI651

    Question about straightness of a planar surface

    Thanks to 3DDave and powerhound. All your inputs are very good for my understanding on this problem. Hi powerhound, I read this problem from the other forum. I agree with what you said about this. My direct feeling is different resource has different background, and different language. I don't...
  6. MQSCI651

    Question about straightness of a planar surface

    Hi powerhound, I love your direct explanation. My current understanding is still that the geometric tolerance is not relative to size tolerance in this case. They are individual each other. RFS = no matter what feature size is, geometric tolerance should be kept in a certain level. There are...
  7. MQSCI651

    Question about straightness of a planar surface

    Because of RFS, no bonus tolerance is allowed in this case. So I don't think "the worst case" is matter with the size tolerance. There are two kinds of tolerances, size tolerance and geometric tolerance. Straightness and flatness are geometric tolerances.
  8. MQSCI651

    Question about straightness of a planar surface

    Hi greenimi, I will take time to read that thread. Thank you for your help,
  9. MQSCI651

    Question about straightness of a planar surface

    "The worst case" may be the most important point in my opinion, because no definition about this. Please let me take certain time to think about it. I will try my best to describe it later on.
  10. MQSCI651

    Question about straightness of a planar surface

    I believe the answer is B(0.2).
  11. MQSCI651

    Question about straightness of a planar surface

    Without MMC or LMC modifiers, you have to use RFS concept, to my knowledge.
  12. MQSCI651

    Question about straightness of a planar surface

    Hi greenimi, you are right, the standard allows you to use both (MMC or RFS). But standard requires you use MMC when the drawing specifies it with MMC modifier.
  13. MQSCI651

    Question about straightness of a planar surface

    Hi powerhound, I am really looking for help with that. Personally I believe that the first priority is to solve the problem whether or not using RFS concept in this case. Talking about partial FOS, there is not authorized standard statement on it. But most cases in Y14.5, you will see no...
  14. MQSCI651

    Question about straightness of a planar surface

    Thank to 3DDave and Belanger for their explanations. Talking about FOS, how should we consider this part which is displayed as attached file as below? Should we treat the part as one that has FOS or partial FOS...
  15. MQSCI651

    Question about straightness of a planar surface

    I am a new one. I have a question for you guys. Question: Is the straightness of a considered planar surface (usually no modifier indicated) used under the regardless of feature size (RFS) concept? For example, please see the Fig.5-6 Specifying a straightness of a flat surface in ASME Y14.5...

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