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  1. Pete_K

    Bonner Bridge (Outer Banks NC) Collapse During Demo

    Couple years ago, while working on the new bridge, PCL cause a power outage for the entire Hatteras seashore because while setting a pile to the side for storage, cut thru the buried power cable. In the height of rental season.
  2. Pete_K

    Liebherr Orion crane failure under 5500t load test

    I'm curious to know how far into the testing program they were. These thoughts are easy to come by in retrospect, but perhaps some thought needs to be given ahead of time to the consequences of plausible failures. I'd imagine a "lesson learned" coming out of this is to evaluate the...
  3. Pete_K

    Hardness testing of thin Inconel.

    Hello, and thanks in advance for reading. We have parts that are made from thin (0.003" and 0.004") Inconel X-750. This material is heat-treated, but we have no inspection criteria other than time/temp charts due to the difficulty in testing hardness of material this thin. There is a lab we...
  4. Pete_K

    Bridge Collapse in Genoa, Italy

    NOVA covered this collapse in a show on 10/27. I haven't had a chance to watch yet, did anyone else?
  5. Pete_K

    Miami Pedestrian Bridge, Part XIII

    The explanation in the M&M report about result accuracy vs. mesh size (and convergence due to mesh refinement) is something I would expect anyone doing competent FEA work to know. If Figg's stress analyst (who repeatedly in his interview stated that he is a stress analyst and not a designer)...
  6. Pete_K

    Miami Pedestrian Bridge, Part XIII

    NTSB meeting occurring http://ntsb.windrosemedia.com/
  7. Pete_K

    Miami Pedestrian Bridge, Part XIII

    I was particularly struck by the transcript of the interview of the FIGG stress analyst. He repeatedly distances himself from the bridge design work by asserting that he is an analyst and not a designer, downplays his responsibility as QA manager, and produces this exchange: "Q. ...when you...
  8. Pete_K

    Newbie: shaft / bearing assembly design

    google "mechanical design of mixing equipment". There's a pdf out there titled that or something close.
  9. Pete_K

    Degreaser for use with Carbon Fiber Sleeve

    Hello, I'm working on a project where we have a permanent magnet motor/generator...the stator and rotor are components that we integrate into our machine. The rotor is comprised of magnets with a carbon fiber outer sleeve. The vendor has given the following material information to us: CFRP...
  10. Pete_K

    Miami Pedestrian Bridge, Part X

    When I read this it reminded me of the Boeing/FAA relationship as it relates to the MCAS problem.
  11. Pete_K

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    Pretty good deep dive into the prelim report.
  12. Pete_K

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    To the point about it being difficult to manually trim the plane (with the wheel) if the stabilizer is at full nose down, the excerpt from the flight manual has a statement about reducing control column force by running the electric trim (with the yoke switches) to a neutral condition before...
  13. Pete_K

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    The Justice Department has subpoenaed Peter Lemme Also, WSJ is saying that apparently the pilots had cut off the electric trim system but couldn't recover. As I understand it, the hypothesis is that with the stab trimmed for nose down, and the elevator deflected upward to counter the trim, the...
  14. Pete_K

    Gas Bearings Experience

    I doubt you're gonna find much as far as gas bearings used with that large of a machine. We use gas foil bearings, but for light-loads. Are you talking about aerodynamic or aerostatic? The largest areas of information on gas bearings, I think, are with TA&M TurboLab and NASA.
  15. Pete_K

    Oroville Dam Spillway Leaking (Again, 18 March 2019) As Waters Rise (Again) Behind Dam

    My interpretation of the photos is that the water is not coming out of, or thru, the spillway. The water leaks past the dam gates. As it descends, it pools at the lateral joints, until at some point (and at a different location) it descends the spillway again, until it hits the next lateral joint.
  16. Pete_K

    Failure of California high speed rail

    Newsom is a total joke. If you want to hear him get torn apart, search on YouTube "Adam Carolla Gavin Newsom".
  17. Pete_K

    Plain Bearings pv value

    That passage in the article is strangely-worded. I think they are just putting a safety factor on it...later on they say that if you run too close to the pv limit, the generated heat may have some undesired effect on the dimensions of the bushing. To mention one-half of something, and then not...
  18. Pete_K

    Interpreting Modbus to Voltage

    Thanks. Not too concerned with time response...we're not looking for quick transients, just want to be able to get steady state values into our system. The CLICK looks like an economical solution.
  19. Pete_K

    Interpreting Modbus to Voltage

    I have what I think should be an easy problem to fix, but I am an ME whose controls experience unfortunately is confined to a former employer's proprietary language, and have only minimal experience with typical commercial PLC's As part of a system we're developing, there is a purchased control...
  20. Pete_K

    Fresh engineer

    As a mid-career engineer who recently got into rotating equipment, I have not found many books that are very helpful...there is so much specialization in different machines for different industries. What I have found to be very helpful are the design reports, analysis reports, failure...

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