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  1. Hydromechdude

    Sensor / Valve Failure Monitoring - Reference Literature / Website

    Hi All, I have a project right now that involves monitoring for failures within a landing gear control system. We have solenoid operated valves that at times fail at the energizing coil and I would like to detect these failures. We have a control box that is capable of monitoring (so I'm...
  2. Hydromechdude

    Job Interviews And Practise

    Recently interviewed for a position that I wasn't so sure about. It lasted about three hours and at the end of it after learning more about the job and company, I realized there was virtually no chance of me taking it. Regardless of even how much they paid me. More of a health and safety...
  3. Hydromechdude

    Built in Test and Electronic Sensing

    Therein lies my problem. I read it and it seemed reasonable to me, although I also tried to reason it to myself, as I thought it was a good statement. So, any literature I can read up on to educate myself with this kind of stuff? Thanks for the reply. HMD
  4. Hydromechdude

    Built in Test and Electronic Sensing

    I have a general question regarding built in testing / failure sensing for electronic components. I realized I lacked this knowledge when reviewing an old failure report as I started wondering how failures are sensed. I'd like to do some research on this topic so that I understand the concepts...
  5. Hydromechdude

    Cable Tension Design Guidelines / Literature

    Thank you very much, rb and Wil. I concluded that for a couple additional pulleys and about an eight foot increase in cable length (initial was probably 100+ feet), the change would not be very much. The cable can go up to 500 lbs load and we're no where near that. I'll look through the MIL...
  6. Hydromechdude

    Cable Tension Design Guidelines / Literature

    Thanks Wil. That's the impression I got from what I've been looking at. Going through the Boeing design manual right now for cables. Question for you. If you had a brand new design and installation, how would you calculate the tension required in order to preclude sagging and snagging on...
  7. Hydromechdude

    Cable Tension Design Guidelines / Literature

    Sorry, suppose I wasn't clear. I'm not looking at the assembly exactly, but rather I'm only curious about what the tension should be on the cable. I'm increasing the overall length of the assembly right now, and as a sanity check I want to determine the new cable tension required. With that...
  8. Hydromechdude

    Cable Tension Design Guidelines / Literature

    Hi, I'm looking to calculate the required cable tension in a closed loop installation (two quadrants with cable wrapped around both). One of the quadrants is connected to a handle for activation, the other quadrant is connected to the rest of the system. What are the guidelines for...
  9. Hydromechdude

    Pressure drop in a hydraulic system why is it important

    Hydraulic circuits are generally not that simple. You can have multiple pumps, valves, actuators, and a whole lot of plumbing. Gotta make sure that when it's all said and done, the pressure at the load is high enough to do what you want. Can you lift 10 lbs? How about 20 lbs? Not really a...
  10. Hydromechdude

    How to calculate flow rates

    The pressure where the pipe runs meet up again will be some value. If you know the downstream pressure where the lines converge and you know the pump pressure, you can calculate flow rates for all branches with the delta pressure. If the downstream pressure is not known, I believe the solution...
  11. Hydromechdude

    Fluorocarbon Seal Information

    Thanks all!
  12. Hydromechdude

    Fluorocarbon Seal Information

    Woops. I meant to write 'are fluorocarbon seals compatible with phosphate ester'. I'm aware that EPDM seals are the best option, but thank you, appreciate the feedback. What I'm searching for is the compatibility with fluorocarbons. hydtools, seems like you're indicating PTFE seals are made...
  13. Hydromechdude

    Fluorocarbon Seal Information

    Does anyone have literate on fluorocarbon seals? I received a vendor analysis report that found fluorine and carbon in the system filters. What fluids are compatible with fluorocarbon seals? Is AS 1241 Synthetic Phosphate Ester compatible I did a quick Google search for fluorocarbon seals...
  14. Hydromechdude

    Where to put most recent, but unrelated experience

    I have a section for volunteer work and I use it (among other things) to demonstrate skills gained not at work. That being said, I only include relevant skills/experiences to the job I'm applying for.
  15. Hydromechdude

    minimum test of faulty servo valve

    What pressure does the system operate at? I've seen some sticky valves that did not function properly at operating pressure, but upon lowering the pressure the valve operated normally. This was due to the valve clearances being very tight and at the lower pressure, the clearances were...
  16. Hydromechdude

    Pipes and tubes: is the difference still taught?

    I've always thought that tubing had a constant OD with changing wall thickness, depending upon pressure, material, etc. The best example I can think of is copper tubing for plumbing, which has the same OD as the tube name. A half inch tube has a .5" OD. I haven't worked with any piping, but...
  17. Hydromechdude

    Question about year end review

    Asking about your personal life seems odd to me, like the other replies have said. Are you sure he wants to know about your personal home interests and not about your personal work interests? I have to prepare a development plan each year and it covers what my interests are, how I'm going to...
  18. Hydromechdude

    hydraulic "burst" test

    This is what I got looking through a report. No reference to a standard or specification, though. I'm in Aerospace so the specs are probably going to be different, anyway. Typical pressures are usually from 2.5x working pressure to 4x working pressure. It all depends on what kind of...
  19. Hydromechdude

    Reversing Polarity in DC circuits

    Thanks guys, appreciate the responses.
  20. Hydromechdude

    Reversing Polarity in DC circuits

    I've been trying to find why reversing the polarity in DC circuits is (except with 'special' devices) harmful. I haven't been able to find anything doing some Google searches, which leads me to believe the reason is so simple and straight forward that explanations are avoided and instead people...

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