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Recent content by drodrig

  1. drodrig

    Tool identification (with colours) in the workshop

    I like the solutions 2 and 3
  2. drodrig

    Tool identification (with colours) in the workshop

    Hi there, We have a production plant with different workbenches. All of them have the same equipment. In order not to mix up the tools they are identified with colours. Just wrapping (insulating) tape around them. This system is not working so well, because the tape comes off. Here a picture...
  3. drodrig

    Welding problems (hydrogen from the air moisture) in an aluminium vessel

    I don't know details, I was looking for some guidelines since the problem is impacting in the project time line The oxygen measurement is a good idea. Preheat is one of their next steps I found this post and there are very nice recommendations: https://www.eng-tips.com/viewthread.cfm?qid=343947
  4. drodrig

    Welding problems (hydrogen from the air moisture) in an aluminium vessel

    Hi, Some supplier is having problems welding an aluminium vacuum vessel. The hydrogen from the air moisture is diluting into the melted aluminium during the welding process. There are large bubbles when it solidifies. X-rays are showing the problem. The new approach is pre heating the...
  5. drodrig

    Bulkhead under vaccum

    Now I would like to explain the case I am working on. We have a chamber which has a section (we call it "insert") that goes inwards. Here an sketch: I want to calculate the wall thicknesses A, B and C, so we divide the problem in 3 sections to support an overpressure of 3 bars (200 N/m2...
  6. drodrig

    Bulkhead under vaccum

    Again: you are totally right. I can now see it. All the numbers are now made
  7. drodrig

    Bulkhead under vaccum

    HTURKAK, You are absolutely right. I got confused with the capital P (single load) and the pressure. I'm still puzzled because according to the formulas: P = q*a^2 shouldn't a Pi be included in the formula? the integrated load (P) should be equal to the pressure (q) times the area (Pi*a^2)...
  8. drodrig

    Bulkhead under vaccum

    I also checked Roars, but found this nice (easy) equation in the Timoshenko Next step is running some simulations, but I like first calculating "by hand" to get an idea thanks
  9. drodrig

    Bulkhead under vaccum

    Here is the definition of "h": I get to the conclusion of the higher stress if we have the same thickness (h) and pressure (P) The relation a/b (outer/inner diameter of the bulkhead) and not the absolute dimensions drive the equation. What about the area? should it play a roll? cheers,
  10. drodrig

    Bulkhead under vaccum

    Hi, I wrote some time ago asking for and end-cap to close a vacuum volume. I learnt a lot from that post and now I am bringing a similar case. https://www.eng-tips.com/viewthread.cfm?qid=416816 After some calculations I wanted to present the new case here. Checking the results there are some...
  11. drodrig

    Non magnetic rails

    But you had a high air pressure to lift the block/skater on the rails? otherwise metal on metal won't be easy to move 3DDave, I don't understand what you mean. It is a magnet in a particle accelerator. We need to simulate the radiation doses and check what material can take it. There is high...
  12. drodrig

    Non magnetic rails

    I don't understand: you slide metal on metal?
  13. drodrig

    Non magnetic rails

    What about the blocks/skaters?
  14. drodrig

    Non magnetic rails

    Thank you all for the answers I learnt earlier today that we can't use plastic or grease. These parts will be in a high radiation area for years, so they would be destroyed. This now excludes the solutions with PTFE, HDPE, lathe rails... Air bearings could be an option, but all the components...
  15. drodrig

    Non magnetic rails

    Here a couple of pictures:
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