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  1. RUFUS2K

    Who makes rigid composite sheets?

    KurtKrDU: I don't understand. You could tell me who makes what I am looking for, or you could make it? And why would answering the question not be allowed? I don't know of any posting rules that would prevent it. Thanks.
  2. RUFUS2K

    Who makes rigid composite sheets?

    A few years ago I got a sample pack of really cool composite strips. I think that there were four strips in the pack and they were about 1" x 4" x .05" thick. The cool thing about them was that each strip had the filaments laid in a specific direction so that each one had completely different...
  3. RUFUS2K

    Calculating required cooling capacity

    Does anyone have a method (spreadsheet, software package, manual calculation template, etc) for calculating the necessary size of an automotive airconditioning system? I need to take into account the solar load through the windows and body, occupant heat, etc. I am working on a supplimental...
  4. RUFUS2K

    Shaft fracturing

    SMF1964: I think that your last statement is accurate. I consider the environment, driver, and load to be unchangeable. I need a material that can withstand the various inputs as they exist now. I really think that the engine characteristics must have something to do with the failures. My lab...
  5. RUFUS2K

    Shaft fracturing

    After an extremely quick crask course on torsional fatigue failures, it is aparent that I have my work cut out for me. It has been many many years since I have had to dust off the types of calculations that I have seen used to shed useful light on the sources of fatigue failures. My initial (and...
  6. RUFUS2K

    Shaft fracturing

    CARBURIZE- Here are some side views. http://flypicture.com/bin/?id=rt31ka/c http://flypicture.com/bin/?id=rt31ka/f http://flypicture.com/bin/?id=rt31ka/e http://flypicture.com/bin/?id=rt31ka/R
  7. RUFUS2K

    Shaft fracturing

    I have uploaded some pictures. I hope that they can shed some light on the subject. The fractured area is only about 1/4" dia. The files are located at: http://flypicture.com/bin/?id=rtr8kKzf http://flypicture.com/bin/?id=rtr8kK3b http://flypicture.com/bin/?id=rtr8kK3d...
  8. RUFUS2K

    Shear shaft on IO-550

    A couple of years ago I worked on a design of a small (approx .5" dia) splined shaft that had a reduced diameter section that was intended to shear in the event that the driven load increased to some unacceptable level. Through some calculation and some experimentation, I arrived on the correct...
  9. RUFUS2K

    Shaft fracturing

    A couple of years ago I worked on a design of a small (approx .5" dia) splined shaft that had a reduced diameter section that was intended to shear in the event that the driven load increased to some unacceptable level. Through some calculation and some experimentation, I arrived on the correct...
  10. RUFUS2K

    Calculating Lbs of water/hr from known latent cooling

    I have lab testing data that shows that an evaporator is doing 11900 BTUH of latent cooling. How do I convert that value into an amount of water produced by the coil. I need to size a drain for the evaporator assembly. Thanks!
  11. RUFUS2K

    AutoManager Workflow Upgrade?

    I am working for a company that is using CYCO Automanager WorkFlow 6.0. They have been happy with it but the problem is that we are looking to upgrade to AutoCad 2004 which is not supported by WorkFlow. CYCO recommends upgrading to AutoManager Meridian, but I was previously at a company that...
  12. RUFUS2K

    Spline consultant or consulting firm

    Dallas, TX
  13. RUFUS2K

    Spline consultant or consulting firm

    Does anyone know of a consulting firm that specializes in splines and drivelines incorporating splines? I have designed an air conditioning system that is driven by an accessory drive pad on an aircraft engine. All of the components have been built and assembled but when I connect everything to...
  14. RUFUS2K

    Overtorque protection

    Desertfox, Well, here are the results. I had calculated that if I wanted the shaft to fracture at 400 in-lb of torque, the shear section of the shaft would have to be .290" in diameter. I tested 4 sample pieces and the actual diameter is closer to .260" dia. I was very happy with...
  15. RUFUS2K

    Overtorque protection

    Desertfox, Yes, I did use that formula. I am interested to see how close the results are to theory as well. I will be sure to let you know how things turn out. Rufus2k
  16. RUFUS2K

    Switch off A/C at altitude?

    If the refrigerant in the condenser is not cooled suficiently, this will lead to higher pressures in the system and an increase in the horse power required from the engine to continue to operate the A/C. The cooling comes from the air moving over the condenser coils. The majority of the cooling...
  17. RUFUS2K

    Overtorque protection

    Wow!, all this activity after such a long time. Thank you all for your input. Let me give you an update on this project since I am almost ready to begin testing on the first batch of sample pieces. I had hoped to incorporate some sort of commercial product to protect the engine driving this...
  18. RUFUS2K

    Diameter of splined shaft

    NickB, Thanks, that is what I thought. And no, the spline details are called out in a different section of the spec.
  19. RUFUS2K

    Diameter of splined shaft

    I am designing a splined shaft that will be driven by an accessory drive pad on an aircraft engine. The drive pad has a 12 tooth internal spline (SAE AS 972B). According to that SAE spec, the driven shaft should have an O.D. of 18.49-18.54 mm. I am having a hard time finding a readily available...
  20. RUFUS2K

    Overtorque protection

    DESERTFOX, Thanks for the great info. I really think that this is the direction that I am going to have to take. It turns out that we have built systems in the past that employed this design but we never did the development in house. One question though, in your formula, is "R" the...

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