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  1. AndrewTT

    Moveable Datum Target Question

    Along with using the new moveable datum target symbol, figure 4-47 from 2009 added a 2X basic 45° and a basic 9 dimension when compared to figure 4-38 from the 1994 standard. Otherwise, these two figures are identical. I have seen at least one GD&T author show their interpretation of a fixture...
  2. AndrewTT

    material selection for load bearing screw (compression)

    I have a compression screw that has a conical tip that terminates in a spherical radius. In assembly the tip of this screw sits in a very shallow dimple. The assemble must pass many tests but the two I am here to discuss are a 30-day salt fog exposure (20% by weight sodium chloride) and a...
  3. AndrewTT

    Controlled Spherical Radius (ASME Y14.5 2009, 2018)

    Does anyone have a reason why a controlled spherical radius could not be invoked as an extension of principles (extension of the principle of a controlled radius)? Thank you.
  4. AndrewTT

    ISO 13715-2019 - figures 21 & 22

    ISO 13715-2019 Edges of Undefined Shape - Indication and Dimensioning What does "t=3" signify in figures 21 & 22? If there is language in the 13715 standard pertaining to it, then I am entirely missing it. Is this a symbol that is described in a different ISO standard? Thank you very much...
  5. AndrewTT

    Dynamic Profile Questions - ASME Y14.5-2018

    1) Figure C-6 (Comparison of Symbols) shows that the ISO standard also has a Dynamic Profile Tolerance. Did ASME add this b/c ISO was going to/had already added this feature? Did the two groups come up with this idea together? 2) Are there measurement devices/software that can handle a...
  6. AndrewTT

    ASME Y14.5-2018 Fundamental Rule q

    ---------------------------------------------------- 4.1 (q) - UOS by a drawing/model note or reference to a separate document, the as-designated dimension value does not establish a functional or manufacturing target. ---------------------------------------------------- Does anyone know the...
  7. AndrewTT

    best way to determine if SS has been cryo treated

    Lets say that you have a part made from UNS-S31600 and this part gets cryo treated for stress relief. Visually this part looks no different before or after cryo treatment. If you wanted to have a test in place to determine if a part had been cryo treated or not, in case there was ever any...
  8. AndrewTT

    Age Hardening of Monel 400

    Will Age Hardening Monel 400 give it any additional corrosion resistance to Ammonia environments or H2S environments? If yes, is the required age hardening process detailed somewhere? Thank you!
  9. AndrewTT

    Galvanic Corrosion Question

    I have an assembly per the attached drawing: Screw - S304, middle component - Beryllium Nickel, lower component - S316. This assembly has been exposed to an electrolyte (salt). The tip of the screw has corroded away. I believe this to be Galvanic Corrosion (GC). When I research GC everything...
  10. AndrewTT

    question on restrained part figure

    Attached is a figure from a GD&T textbook. I was wondering what people's thoughts are on the FCF associated with datum feature C? FYI - this figure is incomplete by intent.https://files.engineering.com/getfile.aspx?folder=75a3d861-87a4-46ec-8f47-762a4d2a77cf&file=11-1.pdf
  11. AndrewTT

    New to DFMEA

    My company is required to use DFMEA by our new iso certification. I have been tasked with leading the DFMEA effort. We have been using the methods of DFMEA already but in a non-formalized fashion. What I mean by this is of course engineers always think about what can go wrong and how to avoid...
  12. AndrewTT

    datum feature interpretation

    I sent a RFQ for a wrench to a Chinese vendor. This vendor has made similar wrenches for us before. We are basically brand new to using GD&T. I know that this vendor has seen GD&T before but I do not know their level of expertise (especially w.r.t. ASME Y14.5-2009). The vendor's proposed...
  13. AndrewTT

    Cpk of profile tolerance?

    I have a cast part that is described with only basic dimensions. There is a profile of a surface (all over) call out on this part. Some at my work have a desire to require that some of the basic dimensions (size features) used to describe the true profile be critical characteristics...
  14. AndrewTT

    C844 Brass with too much Phosphorus

    UNS-C84400 Red Brass should contain .02% Maximum according to many sources online. We have received cast parts that contain too much P (.030%-.040%). What problem(s) might this cause? I am having difficulty finding specific info. on this on the internet and we do not have an expert...
  15. AndrewTT

    datum translation questions

    The "Means this" portion of figure 4-32 (b) states that the datum translation modifier for datum B means "adjustable location within location tolerance". 1) Is this saying that the datum feature simulator can translate 0.1 in either direction? 2) If a gage was made for this part how much...
  16. AndrewTT

    extension of principles - composite profile (non-uniform)

    Can anyone tell me a reason why the attached would not be allowed by ASME Y14.5-2009? http://files.engineering.com/getfile.aspx?folder=284efd45-f3cb-4bfe-839f-d527e977aa26&file=composite_profile_non_uniform.pdf
  17. AndrewTT

    fixed fastener calculation

    Attached is a fixed fastener question from a GD&T textbook. I am interested to see what answers this group can come up with. --------------------- The part with the clearance holes (part 1) assembles on top of the part with the tapped holes (part 2) and is fastened with cap screws. Allow a...
  18. AndrewTT

    Y14.5-2009, figure 5-13 & 5-14

    In figure 5-13, the circularity (free state) FCF is associated with the size dimension. Is this an error in the standard or is there something about the free state modifier that allows this? I cannot find any wording in the text showing that circularity is anything other than a surface...
  19. AndrewTT

    Henry's Law question

    Be gentle, I am not a chemical engineer. Situation) A cylindrical vial with a known, internal volume is filled with an unknown (propriatary) fluid. There is a small air pocket left in the vial before it is sealed off. This vial is then loaded, in compression, with a large enough force to...
  20. AndrewTT

    datum selection - stamped part

    My below questions will be about real world application of ASME Y14.5-2009. Background: This part is stamped from sheet metal (.027” thick). This part is the trigger for a heat sensitive release mechanism. It is soldered to its mating part. The trigger is only soldered to the mating part on...

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