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Recent content by TED7

  1. TED7

    Measurement of gear tooth temperature while gears are running and after stopping

    Take some measurements with an infra red based non-contact system (or thermal imaging, whatever) while rotating - record them. Take some more measurements with a contact based system stationary - record those too. Graph the two methods against each other. You might find that the non-contact...
  2. TED7

    Metric threads - ISO 965-1 and BS 3643

    From my understanding, BS 3643 is based the suite of ISO standards, so much so from my experience that I'd go so far to say it just paraphrases them. I don't know if this is my having worked for a "European" companies for so long in the past, but if BSI has adopted and published the ISO...
  3. TED7

    Has Eng-Tips buffed up your resume?

    I've never used it on my resume but it has gone into my Chartership (UK) application. Which I still need to submit. I've not been specific about it other than use it as an example of participating in professional development and the promotion of mechanical engineering.
  4. TED7

    Rear Brake for a Trike

    I don't have a great deal of experience with the design of automotive braking systems but I do own a car without ABS. If I stand hard enough on the brakes to lock the wheels, the front wheels will lock first - this means that in a locked wheel scenario, I continue travelling in whatever...
  5. TED7

    Are you an engineer at all??

    I've been in and out. Currently I'm working on safety justifications; almost all of it is explaining why something is safe, because x. Then writing wordy reports to convince the regulator that it is safe. It absolutely requires an "engineer" to comprehend but is in no way "engineering".
  6. TED7

    Car Gasket Exhaust pipe design

    The last few exhaust gaskets I've purchased have all been made of what appeared to be recycled soft drink cans, the outer surfaces were shiny but the inner layers definitely had coloured print and 'ingredients' listed on them. Worth noting that these were post-catalyst gaskets, the cooler end...
  7. TED7

    Things they forgot to mention in the interview

    I worked at an engineering consultant's once. I understood what field of engineering I was going in to, and what work I would be doing. What I didn't realise was that 90% of it would be on a secondment to another company, where I had already interviewed, and decided that I didn't want to work...
  8. TED7

    What is my job title?

    I've had all kinds of job titles. Design Engineer, Tooling Engineer, Instrumentation Engineer (Mechanical), Manufacturing Engineer. I just call myself "Engineer" now. I'll replace that with "Senior Engineer" once I'm Chartered. Until then, who am I to determine if I'm senior or not, I don't...
  9. TED7

    FMEA Risk Priority Number (RPN) - what is the minimum threshold to rank the RPN as "High Risk&q

    I've seen 100-150 determined as being the threshold at various places; but it's all hand waving. I've had FMEAs throw an 80 that I wasn't happy with and wasn't a challenge to reduce, so it got reduced. RPN is a tool to rank things against each-other, not to determine what you need to work on...
  10. TED7

    Different fittings materials (temporary applications)

    The worst the would happen might be that the connection leaks if they experience differential expansion / contraction and you get some diesel on the floor. If they seize through galvanic corrosion, you might have to apply some extra force to separate them again. I had couple of stainless steel...
  11. TED7

    Impact Loading

    I clearly don't exactly know what problem you're trying to solve, but I went through the Impact Load problem some years ago. I eventually decided to give in and just added a rubber bump stop and let time tell if it was going to work or not. If you've got to justify something, or can't accept...
  12. TED7

    Slitting Inconel

    Horizontal mill or maybe a slitting saw on a vertical mill - Use the table to traverse the cut across otherwise you'll get a radius on the bottom of the slit. Check speeds and feeds for your grade of Inconel, it's a pain, don't attempt it with blunt tooling.
  13. TED7

    Sub contract machining

    It really depends who you're aiming at getting business from. You'll get nothing from large companies because they'll work to ISO 9001 and will require their supply chain do the same. Mid-sized companies will likely also exclude non ISO 9001 as often they're in the supply chain for a large...
  14. TED7

    X-ray Slot Weld on Assembled Pressure Vessle?

    You can attempt to shoot the whole component if it's small enough. Pipe welds are often shot at an angle (45° for example) with the source one side and the plate the opposite side. It gives an oval image of the entire weld but you might get depth of field issues with some of the image out of...
  15. TED7

    X-ray Slot Weld on Assembled Pressure Vessle?

    If the cracking you're looking for is surface breaking, why would you not penetrant test? If you can't put a plate inside the assembly, can you not put the plate outside and the source inside (it'll be gamma rays not x-rays but still RT)?
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