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  1. rollingcloud

    Is my understand of the FRTZF correct?

    My main concern is the distance between the char 36 (Ø0.312 - Ø0.314) hole and the char 40 (Ø0.377 - Ø0.379) hole. This distance is not explicitly shown on the drawing, but it can be calculated in its basic form using char 49 and char 59 & 60, yielding 0.8133. My goal is to determine the...
  2. rollingcloud

    What's the main cause for incomplete silver brazing on stainless steels?

    I have never done any brazing. Our vendor in America is having issues brazing a 321 SS half sleeve onto a 321 SS tube. The tube OD is about .375''. They have a large fallout due to incomplete brazing. The gap tolerance between the sleeves and the tube is .001 - .014''. The sleeve ID is .190 -...
  3. rollingcloud

    Is heat scale cosmetic only?

    The material is UNS S42716. It was supposed to be heated to 1925 °F (1052 °C), held at heat for 30 minutes, quenched in oil, sub-zero cooled to -100 °F (-73 °C), held for 2 hours, warmed in air to room temperature and tempered at 350 °F (177 °C) for an hour. Is the black discoloration a heat...
  4. rollingcloud

    installation vs seating torque

    In the case of self-locking nut. Is it normal to have different definitions across different specs, within the same industry? I am so confused, AS spec should in theory be aligned with GE spec. However, I am not seeing that, am I interpreting it correctly? AS spec says: Assembly torque is the...
  5. rollingcloud

    What is the most likely reason for the wear on the bolt's thread?

    The supplier informed us that the test bolt threads are experiencing wear during a reusability test for a self-locking nut. They observed a change in thread dimensions after just 2-3 cycles, along with increased heat generation. The nut is silver-plated and waxed, and it is crimped to create the...
  6. rollingcloud

    [CIE76] How much of delta-E does this represent?

    Using a color meter or spectrophotometer to measure the variation between the area in the red circle and the upper area, what would be the approximate delta-E? I have never used such a tool, but my supplier is saying it's less than 3.0 and is acceptable. But since it's clearly visible to naked...
  7. rollingcloud

    What would be the most likely cause of nut thread stripping?

    The new supplier stated that the thread of the nut is chipping out during the first removal cycle after baking (image attached) and the nut is getting stuck after 3-4 cycles of room temperature torque test. https://imgur.com/a/c18sqkU .190-32 UNJF Nut material: A286, hardness 24- 37 HRC, 130...
  8. rollingcloud

    Where in ASME Y14.5 does it mention about using basic dim as gaging point?

    I have a drawing that does this: I know the standard allows the location of datum targets defined using basic dimension and letting the gaging tolerance act as basic dim's tolerance. But can this be extended to general dimensions?
  9. rollingcloud

    what is the relationship between the radial & axial play in a metal-to-metal bearing?

    The axial play is defined as the distance by which the inner ring/ball can be moved in an axial direction relative to the outer race from one extreme position to the opposite extreme position. Radial play is the total displacement of the ball in the radial direction. Sometimes I see both...
  10. rollingcloud

    How to denote the profile tolerance so that it controls everything?

    I have this drawing done by someone else, I am trying to get an better understanding of the tolerances for the highlighted dims. https://imgur.com/a/zHWWIOZ The yellow surface is the datum C. I believe the intention of the drawing is to have a single profile tolerance controlling everything...
  11. rollingcloud

    Best method to verify NI/CR plating composition?

    Out of ICP, OES, SEM, EDS, and XRF, I guess XRF would be the cheapest method. However, since XRF penetrates thin layers and we have a portable XRF gun, would it just include elements from both the plating and the underlying base metal given that nickel/Cr plating is often very thin (e.g. 0.0005'')?
  12. rollingcloud

    How much hardness change can I expect from a low-level stress relief on a 17-4 SS part?

    It's a casted part that is required to undergo the following heat treatment: 1. Homogenization Heat Treatment Temperature: Heat to 2100°F ± 25°F (1149°C ± 14°C). Hold at heat for not less than 90 minutes. Cooling: Cool as required to room temperature. 2. Solution Heat Treatment Temperature...
  13. rollingcloud

    Which segments does the profile callout refers to?

    https://imgur.com/a/5mc1RrY I am trying to create a profile-checking fixture. I often see segment profile callout using points, for example, A <--> B, but this one has no such thing. Below is my interpretation of the profile segments. https://imgur.com/a/llzIPCb How do you draw the maximum...
  14. rollingcloud

    Go-no-go profile checking fixture for a rubber ring?

    I have a rubber seal ring about 30'' in diameter. See cross-section below: https://imgur.com/a/Lmu1AN0 I was asked to make a Go/No-Go fixture to check the profile. I wonder how other companies perform quick checks on this type of profile. All I can come up with is checking half of the seal...
  15. rollingcloud

    When all three datums are center planes and are perpendicular to each other

    This is a spherical part, with two holes that are perpendicular to each other. First of all, I know you cannot legally label datums on centerlines, so this drawing is incorrect. (And I would disagree with setting the mid planes as the datums. I would probably set the flat surface as the main...
  16. rollingcloud

    Male and female seating angles?

    I believe this is called flared seats. They all around 45 degrees. Should the female angle be manufactured a little bigger than the male angle to avoid interference? I think this would result in a line sealing contact. For example, male angle: 43°/45°, female: 44°/47°. In my case, the height...
  17. rollingcloud

    Function of the gap inside the displacement chamber of a constant speed drive?

    Is this for thermal expansion of the fluid? The piston has a constant size, so when it reaches the bottom, there would be a tiny gap around the end of the piston. Below is an Axial Piston Pump that also has an expansion in the displacement chamber, but it's located in the middle of the chamber...
  18. rollingcloud

    Is loading criteria sufficient in quality control of flex shaft core?

    Is it a good idea to remove the heat treat process control on the flex shaft core? The new vendor has a heat treat process that is a trade secret and is asking us to remove the standard heat treat process. I proposed specifying a hardness range after removing the heat treat control, but they...
  19. rollingcloud

    confusing drawing. Why is the distance between the cutouts not dimensioned?

    [Reposting this thread as I had to remove my original post due to the inability to remove sensitive material.] The size of the cutouts (bigger holes) is stated, but I have looked everywhere on the drawing and could not find the distance nor its tolerance. One of the drawing notes states, "GD&T...
  20. rollingcloud

    Pressure control resolution

    This is for pressure testing on a pressure relief valve. The aim is to adjust the inlet pressure from 0.00 to 150.00 psig. However, we are experiencing jumps in the pressure readings, typically in increments of 5-10 psig—for example, jumping directly from 110 to 120 psig. Ideally, the pressure...

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