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  1. rollingcloud

    installation vs seating torque

    MintJulep, AS = Aerospace Standard. Pretty sure it's GE Aviation division. GE spec's installation torque has no mention of preload/axial load at all, the protrusion is what defines the "installed" state for the max installation torque.
  2. rollingcloud

    installation vs seating torque

    SWComposites, sign...as if these countless different torque names are not confusing enough already, and who came up with these names, my god. They might as well as remove the words and name these torques with number sequences, so we know exactly what phase the torque belongs to.
  3. 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...
  4. rollingcloud

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

    Thanks Ed, the actual mating bolt is made of Inconel 718 with a min hardness of 36 HRC. I wonder why they allow the nut hardness to be 32 - 44 HRC and the test bolt to be 32 - 42 HRC in the first place.
  5. rollingcloud

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

    dvd, I am not seeing a direct correlation between the proof load test and the wear on the thread.
  6. rollingcloud

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

    Thanks Dave, definitely going to try that first.
  7. rollingcloud

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

    Tugboat, The nut needs to be reusable; the test assembly is only used for a single test run (15 cycles). I don't believe it's meant to be re-plated; the test procedure only allows oil lubrication in-between cycles.
  8. 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...
  9. rollingcloud

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

    CWB1, Good point, I will double check with the supplier. What's BJA? Bolt joint assembly?
  10. rollingcloud

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

    TugboatEng, Having the same material would make the galling issue worse, no?
  11. rollingcloud

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

    mfgenggear, The DFL's max operating temp is 800 F. The drawing calls for a spec which requires reusability test, this spec (active since 1985) is used for other similar nuts as well, I would have to assume it can be reused under some conditions, otherwise, I don’t see the point of the testing...
  12. rollingcloud

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

    Ed, The picture above is all I have right now, it looks like a lot of material is stripped off. The previous supplier did not have this issue, and the new supplier have been having issues with parts lately.
  13. rollingcloud

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

    Dave, The required dry film lubricant is EVERLUBE® ESNALUBE™ 382 Gray PWA-36545T Spec Low VOC Thermally Cured Mos2 Solid Film Lubricant, pretty much exactly what you said. The spec does require coating the lubricant prior to any 750 F+ heat and allows the coating to be reapplied between cycles...
  14. 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...
  15. rollingcloud

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

    The tiny keys are the allowance for the mismatch, the fillet radius is not part of the profile per my interpretation. Since the profile callout has no datums, its only controlling the form and size, so maybe I could break up the profile into length and angle which is easier to measure? To...
  16. rollingcloud

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

    Forgot to update the thread. I later realized that the profile is only on one side of the seal, so the fixtures that I initially proposed would only be checking the max/min material condition of entire part, which is not exactly useful. See link below for the actual drawing...
  17. rollingcloud

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

    mfgenggear, Thanks for the idea. It's flexible. the hardness is about 75 shore A. The goal for the go fixture is to go in without any compression on the seal, would it be better to cut the fixture in half to expose the cross-section? that way we have a better view and perhaps can use feeler...
  18. 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...
  19. rollingcloud

    Male and female seating angles?

    Thanks guys on the inspection methods. As Jboggs has pointed it out, any point/line contact would likely to damage the sealing surface. I am assuming that means both male and female angles need to have a nominal angle of 45, or having the same angle within a very tight tolerance, but what kind...
  20. rollingcloud

    Male and female seating angles?

    mfgenggear, What about the internal angle inspection? Mold is probably not good enough for this size.

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