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Recent content by mprice

  1. mprice

    IR Absorbing Paint

    IRstuff, Thanks for your response. I intend to cool the back ground with water flowing through a tube near to the surface. Regards Matt
  2. mprice

    IR Absorbing Paint

    Is it possible to buy paint which absorbs IR light? I would like to measure the temperature of a small target (1mmx1mm) using an optical pyrometer. The problem is that I will probably end up measurinmg the reflected heat from the the surfaces around the target. It has been suggested that I could...
  3. mprice

    Heat transfer through a hollow cone

    c2sco, thanks for sorting that out - all is clear. prex , thanks for the further anaylsis. Using the corrected height of the truncated cone I now get the same result with your formula and the formula developed by c2sco. That is DT=36°C. Many thanks for your inputs Matt
  4. mprice

    Heat transfer through a hollow cone

    speco, At the small diameter of the truncated cone is a target heat source of about 50W. I would like to estimate how this heat energy will be conducted away from the target area by the conical wall which supports it. The cone is just a part of a larger tube body part of which is eventually...
  5. mprice

    Heat transfer through a hollow cone

    C2sco, Thanks for your response. Without a diagram, as you say, it is difficult to explain geometry. Actually if the Truncated cone were sitting on its 37.5mm diameter base then its apex would be 22.35mm high. The Small diameter is 11.5mm. The hot boundary distance Xh is 11.5/37.5 x 22.35 =...
  6. mprice

    Heat transfer through a hollow cone

    Many thanks to all for your contributions, Stuart (c2sco) - your reply has been particularly helpful. I gave very few specifics and I can see that there are several approaches. What I am trying to do is estimate the dT through a tube body. The cone is part of the body. I am ignoring...
  7. mprice

    Heat transfer through a hollow cone

    Does anyone know how to caclulate temperature gradient along a hollow cone. Heat flow is from small end of cone towards larger end. I am only interested in heat flow inside the walls of the cone.
  8. mprice

    ISO 1238 and AGMA, tangential composite deviation

    Hi Gear Experts! I need to specify plastic gears for tooling in China. They work to AGMA standards whereas we work to ISO. Is the ISO 1328 quality class the same as AGMA? And a second question, do I need to specify total and tooth-to-tooth tangential composite deviation in the gear table or is...
  9. mprice

    Zinc Plate and Passivation Spec

    Thanks to Goahead and arto for your responses. I actually need the EuroNorm standards (if they exist) for two processes, they are: 1) Electrolytic Zinc Plating process of low carbon steel sheet metal parts. I think I need the EN equivalent of ASTM B633. For example a simple bracket is formed...
  10. mprice

    Zinc Plate and Passivation Spec

    Does anyone know which standards (Euro Norms or equiv)do I need to use when specifying: A) Electrolytic Zinc Plating of formed mild Steel sheet metal parts and B) Passivation using Cr3 and conforming to RoHS. This will be used in an office machine. Thanks Matt
  11. mprice

    Heat / Utrasonic Staking

    Hi, Does anyone know of any technical information about heat / utrasonic staking for joining a plastic injection mouldedpart to a sheet metal part. I want to use one of these processes to avoid using screws but I have found very little technical information. I would like to know what are the...
  12. mprice

    Manufacturable Extension Spring

    Thanks israelkk for you quick response. I only occasionally need to design springs but I like to ensure that what I have designed is at least possible, before I get involved with profesionals. I haven't got the books you mentioned- I should buy one of them.
  13. mprice

    Manufacturable Extension Spring

    Hi, I want to design a spring that is manufacturable. I need to know acceptable values for number of active coils and initial tension for extension springs. I am using 0.63mm dia spring steel. I have got 8.5 active coils and an initial tension of 1.337N which is 8.5% of the max spring force...
  14. mprice

    Welding joints without filler

    Thank you Sayee for your quick response Regards Matt
  15. mprice

    Welding joints without filler

    Hi, Does anyone know what to call welding which requires no filler. In german it is called "verschwemmt" but I have been unable to find a translation into english. We put this text on drawings of sheet metal parts where a mortice joint between two st. steel parts is welded after...
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