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  1. TheBlacksmith

    "XL" rating for car tires

    I have a Focus ST with 235/40-18XL tires. It is ungoverned and drag limited to about 150 mph, not that I intend to drive that fast. I can find plenty of talks about not using a lower SPEED rated tire, even if you don't drive that fast because of adverse affects on handling in how the tire...
  2. TheBlacksmith

    Motor Inrush Current

    We have several in-house publications citing that an electric motor in-rush current should be 500% of rated current. Is this rule derived from some obscure agency specification I can't find or just someone's rule of thumb for a good design basis.
  3. TheBlacksmith

    Power Factor Tip Up

    I am involved in a generator development project. The development process involves preliminary testing on full coils in a test jig, followed by testing the completed generator. Obviously some time will elapse between the two. How reliable are the results of a power factor tip up/tan delta...
  4. TheBlacksmith

    New Automatic Transmission Service

    Why do the new automatics require frequent servicing? I remember when you checked the fluid and except for severe service, NEVER did preventative maintenance on an automatic. Now a lot are recommending fluid/filter changes at 30K, regardless of service duty - in an era of "100K&quot...
  5. TheBlacksmith

    Flat roof repairs

    Recently the family "camp" has passed to me. It was built in three phases over the years, a gable roof going North and South, a second addition gable roof East and West and the final, a FLAT roof going East and West. It is leaking between the second and third sections. As an advanced...
  6. TheBlacksmith

    Corona Detection in a Generator

    We are working with a new design medium voltage generator and are concerned about corona. To ensure long life, we know corona should be minimized and there are insulation systems, etc. that are supposed to minimize/manage corona. We need to know what initial testing is being done to detect...
  7. TheBlacksmith

    What's taking so long?

    As I was sitting in traffic last night, at one of two tunnels between my office and my house, I had time to think. They have proposed a third tunnel, and hope to have it open by 2015! As a frequent watcher of the History Channel, it seems that we build the Panama Canal, the Empire State...
  8. TheBlacksmith

    Firestone AT Tires

    Looking for expert's opinions/views strictly for personal curiosity. For the record, my new truck has 16 inch Wilderness HT tires, 35,000 miles with no problems. We live in an era of high tech materials, tools and processes they didn't even dream of a generation ago. I remember when buying tires...
  9. TheBlacksmith

    Stress Cones/Voltage Grading Sleeves for 15kV Connections

    A little background. I am a ME, working on a new project with EE overtones. We are designing a new (for us) generator with a terminal voltage of 13.8kV. For design purposes, we have assumed a voltage grading sleeve length of 16 inches, with a 3-inch lug to connect to the generator. The output...

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