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  1. DaveScott

    Recommended coating for steel mill roller tables

    Steel Mill roller tables (and other related equipment nearby) have high temperatures in some areas (radiant heat from hot slabs and plates), continuous wet conditions in some areas, and water splashed conditions in other areas. The water is typically 35-40C although there is steam generation...
  2. DaveScott

    Transformers Redundancy

    I think it depends on the value of the process, and details of the load. For example, if you can drop 40% load in an emergency, then you could purchase two transformers, each with 60% capacity.
  3. DaveScott

    Gassing in Furnace Transformer

    //All 8 core bolts were replaced and positively grounded// Would that stop the circulating currents, or increase them? Were the materials correct? The opposite direction would be, of course, to insulate them.
  4. DaveScott

    Dry vs oil cooled transformers

    Does anyone have any comments about reliability?
  5. DaveScott

    Current imbalance persisting.

    itsmoked, looking at the relay, the looping is effectively multiplying the 'real' (not %) current imbalance. Wouldn't the OOB model be more suitable?
  6. DaveScott

    Current imbalance persisting.

    itsmoked, I don't know the details of why you have nine connections and so on, but I would suggest perhaps there is a difference in reactance on each phase of the motor. Effective reactance will obviously depend on winding details, iron core but also the speed of the motor at different angles of...
  7. DaveScott

    cat5 ethernet, 120V interference

    OK, please let us know how you get on.
  8. DaveScott

    Cost & Feasibility of Metallurgical Analysis

    rxmelaun, there is another, older, method which I came across once: If you could get some samples of known crankshaft material and use a high speed grinder, then you could compare the sparks from the known types to the unknown type. Perhaps if you got someone to photograph the results it might...
  9. DaveScott

    cat5 ethernet, 120V interference

    I assume it is a ladle transfer car that you are talking about. Can you find a reel that doesn't have brushes? This would surely be the biggest problem. I would suggest that you review the wireless system again - if you can get it to work, it would save a potential maintenance problem. May I...
  10. DaveScott

    Fuse problem notification.

    Reminds me of my apprenticeship days in the steel works: I noticed that to isolate an un-identifiable cable one dubious practice was to short it out, and rely on the fuse or circuit breaker to trip. That was until one 6 inch nail which had been hammered into the cable started glowing bright red...
  11. DaveScott

    What is 40CrMo4V ?

    There is a direct JIS standard: SNB16(see link). Standard comparison: http://misumiusa.com/CategoryImages/Metric_2006_pdf/METRIC1863-1864.pdf SNB16 spec: http://www.metalsamsung.com/bolting_material_properties.htm Also see ASTM comparison for SNB16: http://www.diekson.com/3.htm = ASTM A193-B16
  12. DaveScott

    In-line bulk density of powders sensor

    Perhaps this is of interest: http://www.cidra.com/iss/appnote/powder_massflow_BI0261.html There are also microwave based instruments, which I think are intrusive.
  13. DaveScott

    In-line bulk density of powders sensor

    Do you want to measure the overall density of powder in a pipe, mixed with the transport medium?
  14. DaveScott

    One thermocouple feeding two devices

    AK2DM, you didn't mention what kind of accuracy you wanted in your measurement. Each device in your cabinet will produce a counter emf depending on its dissimilar metals and local temperature. I suppose that these will be averaged and each device will have more error (one will read higher than...
  15. DaveScott

    Looking for help/info on photo diode project

    Ah, with that kind of speed, and small target size, I would suggest a line laser (not expensive), and a cut-down fresnel lens to convert the diverging light back to parallel. That's the transmitting part finished. The receiving part could be a long line of individual photodiodes, as the object...
  16. DaveScott

    Looking for help/info on photo diode project

    I think you might want to consider using fluorescent tubes, and a linear position sensor, or photodiode array, with an appropriate lens in between. It's not perfect, but it would be effective. See...
  17. DaveScott

    crane application motor?

    example - http://www.cranehandling.com/misia.htm by google search: http://www.google.co.th/search?q=%22cone+brake%22+crane+hoist&hl=en&start=0&sa=N
  18. DaveScott

    Compact power supply

    These two links have some cheap power supply units. http://www.cybermarket.co.uk/ishop/923/shopscr3897.html http://www.maplin.co.uk/searchtemplate.asp?criteria=12VOLT%203%20AMP%20POWER%20SUPPLY
  19. DaveScott

    power required to lift a mass

    //2724,000watts = 2.724kW// You might want to edit that.
  20. DaveScott

    strange specification for a ABB asyncronous generator

    Isn't the 6319 C3 bearing a locating type? One end should be locating, and the other end sould be non-locating to allow shaft growth etc. If the customer has specified locating types at both ends, then this will surely give problems.

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