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Recent content by Ricko

  1. Ricko

    Cracking problems in Heat treating 4340

    I concur that more details are in order. It is important to know "exactly" what the drawing requirements are. I'm particularly interested in what the draw temperature was. Another point of clarification is in order -- What was the nature of the crack? Was this classical quench cracking, or...
  2. Ricko

    Equivalent Cooling Rates for Different Geometries

    I'm trying to locate information that will identify equivalent half radius and center cooling rates between a spheres and a round bars. Standard hardenability curves scale Jominy data to round bar diameters. I'd like to be able to translate this to equivalent sphere diameters. Does anyone have...
  3. Ricko

    Mechanical Properties of Aluminium Alloys

    Try the following site: http://www.matweb.com/index.asp?ckck=1 Ricko
  4. Ricko

    Hardness not up to spec

    I agree with gdodd. I reviewed AMS 6350 and it only specifies a maximum hardness in the annealed condition....no minimum -- though the value you have does seem low for 4130 Cond A. Have the steel chemistry checked by the supplier.
  5. Ricko

    Material for burner nozzle

    You didn't indicate what your operating temperature is. If it is below 1000 F, have you considered a carbidic grey iron? Chromium alloyed gray iron can develop considerable carbide content (10-25%) which has excellent wear resistance. CWC produces a material they call proferal or super...
  6. Ricko

    Water lubricated journal bearing

    My first thought was the cutlass bearing on the prop shaft of inboard engine mounted boats. I know they are made from a bronze shell with a rubber liner, but I can't give you anymore specifics. My advice if you want to persue this is to contact a marina supply retailer and get a name of a...
  7. Ricko

    Torque on two sides of a gear box

    Its been almost thirty years since I had to do these type of problems, but it seems to me that given only what you have, you either have to assume or are given that this is a constant velocity problem. Assuming then that, dV/dt is zero, you are left with the equation Mm = Mt/G which you can...
  8. Ricko

    Nitrided Gears

    White layer is not normally tolerated on gears due to its brittle nature and high line contact loads to which many gears are subjected. There are exceptions. The benefit of nitriding gears is that extremely good dimensional control is possible because the gear is finish machined (with some...
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