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  1. rollingcloud

    Is my understand of the FRTZF correct?

    variation from the true center is the same as treating the basic dim as a nominal and then applying the true positional tol on it though. Kind similar to the X & Y-deviations in the calculator: https://www.gdandtbasics.com/true-position-calculator/
  2. 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...
  3. rollingcloud

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

    It's actually supplier's vendor, they used to have a different brazing vendor which was doing fine for the most parts, see attached photo for a good brazing case. I am guessing they just need to match the mating parts before brazing to ensure the gap is small.
  4. rollingcloud

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

    The supplier used 140-mesh powder. Vacuum furnace was most likely used. Would a 60-mesh work better? Or it would not change the outcome given the large gap? Is powder the worst form of a filler material for large gaps?
  5. rollingcloud

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

    Thanks guys, I have asked the vendor to provide more details, hopefully it's just a gap issue.
  6. rollingcloud

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

    Do you mean you can still achieve a complete brazed joint if the gap is greater than 0.010'', with the proper amount of flux and the appropriate filler wire size? The joint has no load bearing requirement; the vibration is the main concern. But I am aiming for 100% complete brazed joint edge.
  7. 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 -...
  8. 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...
  9. 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.
  10. 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.
  11. 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...
  12. 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.
  13. 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.
  14. rollingcloud

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

    Thanks Dave, definitely going to try that first.
  15. 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.
  16. 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...
  17. rollingcloud

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

    this one was taken side by side with the yellowed part.
  18. rollingcloud

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

    Thanks for the info. The supplier said that the yellowing is due to the plastic compound. I also noticed that yellowing due to polymer chain degradation is typically uniform, the yellowing on my part appears to be different, resembling a pattern of the natural movement of viscous fluids. Does...
  19. rollingcloud

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

    I agree the lighting is bad. The color meter was using the previous good parts as reference, so it does not have to be on the upper piece. See a good part below, would the yellowing in my original post equivalent to a delta-E of >3?
  20. 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...

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