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Recent content by RLJ

  1. RLJ

    WARNING! Excel order of operations problem...

    swearingen, et al, I do not see -(5X5) as the same mathmatical expression as -5^2. -(5x5) means that you are simply turning a positive product into a negative value. Mathematically it could also be written as (-1)X(5X5). Mulitplying the -1 through the equation would result in (-5X-5), which...
  2. RLJ

    WARNING! Excel order of operations problem...

    -5^2 is equal to 25! -5^2 = -5 X -5 = 25! When two negative numbers are added together they equal a negative, but when they are multiplied they equal a positive. If you multiply -5 X 5 you get -25. RLJ s-)
  3. RLJ

    Metric Beam Engineering Data

    A sincere 'Thank you' to all that replied to this string. Your comments and direction have been a great help. We now have a company representative in China and I look forward to getting more information on this subject. Until then, thanks again. RLJ s-)
  4. RLJ

    Metric Beam Engineering Data

    Thanks for the helpful replies. Does anyone here have similar information about steel sizes that are available in China? I am looking for typical beam, channel and angle sizes available and engineering data, using the beam sizes in the original post as a starting point. RLJ s-)
  5. RLJ

    ownership

    tlf, I have heard my whole life that a person will never get rich working for someone else. Review your personal reasons for wanting to be partner: cash, prestige, power? There is nothing keeping you from striking out on your own. Discuss it with some of those customer contacts you have...
  6. RLJ

    Metric Beam Engineering Data

    I am currently working a project that requires the use of metric sized beams. Parker Steel International provided data for general sizing and drafting. What I need now is firm engineering data; section modulus, moments of inertia, etcetera. The particular beams that I am currently interseted...
  7. RLJ

    Calculating screw conveyor flowrate

    Calculating screw conveyor flow is not extremely difficult, but it does take some figuring. The following works for solid materials. Liquids or sludges are another story all together. First, determine your materials density Kg/Cu-M or Lbs/Cu-Ft. You want this to be consistent if possible...
  8. RLJ

    Protection of CI in molten aluminum

    I am looking for a material coating which can be applied to cast iron that will protect the cast iron when submerged into a molten aluminum bath. The coating would have to withstand 1400F temperatures, moderate abrasion, and expand similar to the cast iron. I would prefer to keep the coating...
  9. RLJ

    8620 to 11 - 14 Hatfield comparison

    arunmrao, We currently case harden the 8620 to a depth of 0.120" with a total material thickness of 0.500". If the manufacturing benefits favor the 8620 we could always increase the depth of case hardening. Which material is easier to cold work? RLJ s-)
  10. RLJ

    8620 to 11 - 14 Hatfield comparison

    mcquire, Thanks for the response. Do you know of a good web source for chemical composition and performance data on these two materials? RLJ s-)
  11. RLJ

    8620 to 11 - 14 Hatfield comparison

    I am reviewing the manufacturing process of a cone shaped piece currently made of 8620 material. The material is cut flat and rolled into the cone shape, cold working the 8620. @28" large diameter, 16" small diameter. Then a mild steel mounting ring and base are welded to it. The...
  12. RLJ

    Looking for Reference Material

    Mudfarmer, Try Whiting at www.whitingcorp.com. They have produced a very detailed book on crane manufacturing. However the last time I checked their website the book was unavailable as it is in update for a future release. The last I knew it was free for the asking. Also try the Crane...
  13. RLJ

    Explanation of BU-AC ralating to evaporation

    phoward, Excellent batch of information. Additional information: The Boiling point is 350F to 415F; the falsh point is 145F; and the vapor density is 5.3 (air = 1.0). This, combined with your information, tells me that we should have a very slow evaporating product that will drop and fill low...
  14. RLJ

    Explanation of BU-AC ralating to evaporation

    I am reviewing a MSDS of a product that shows the evaporation rate as: {Evaporation rate (BU-AC=1) = 0.03} This is similar to vapor density using air as 1. However, I do not know what BU-AC is or its evaporation rate. Can anyone explain this? Thanks in advance, RLJ s-)
  15. RLJ

    Steel Thermal Expansion Calculators on Web

    Are there any good down loadable spread sheets for determining proper OD expansion of a round steel tube when heated to several hundred degrees F. Thanks RLJ s-)
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