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JHW 3d

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JHW 3d last won the day on June 24 2017

JHW 3d had the most liked content!

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About JHW 3d

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    Here's Johnny...
  • Birthday July 15

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    Los Angeles, CA

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  • Engineering Field
    Robotics & Automation
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Recent Profile Visitors

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  1. Meme Battle

  2. Things that are worse than failing the PE...

    1. Buying a pizza in 2010 for 10,000 bitcoins.
  3. Forum Banning Game

    Banned for not going away.
  4. Meme Battle

  5. Meme Battle

  6. Forum Banning Game

    Banned for not being a team player.
  7. Forum Banning Game

    Banned for coddling @Audi driver, P.E..
  8. When is it necessary to harden steel?

    Thru-hardened steels are stronger, and the UTS is tabulated vs hardness value (link, see p. 2). Surface hardening (i.e. carburizing, nitriding, cyaniding, etc.) are often used for gears to increase contact stress resistance, while maintaining a softer core for resistance to shock, but hard enough to resist the bending stresses. In practice, for a thru-hardened steel (e.g. for a transmission jack shaft), a nominal stress is calculated, and a necessary safety factor is needed, so the strength of the material is defined, leading to the hardness specification on the drawing.
  9. A lawyer would not object to a relevant question, assuming your PE license is relevant to your expertise. By the way people, a PE license does not make you an expert: it states you satisfied the minimum requirement by law to practice in your field. Establishing your expertise in a court of law would require further interrogation. How many attempts at passing your licensing examinations would be relevant, as would your advanced degrees, positions held, publications, etc.
  10. If you are ever in court as an expert witness, it would be a likely question from opposing counsel, obviously in an attempt to discredit you. Happened to my dad - though in his case he did pass on first try so it was a stupid question.
  11. Truth of the matter is...

    TOTMI it was kinda true, but now it’s not. Welcome back from the dead, TOTMI thread!
  12. Horse is to stable

  13. Horse is to stable