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  • Users: drodrig
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  1. 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...
  2. 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...
  3. 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...
  4. drodrig

    Non magnetic rails

    Hi there, We need to insert an aluminium chamber (around 2 meters - 6.5 feet in diameter) into a magnet. It is 3 tons. Room temperature, clean environment. The total length to move is 8 meters -26 feet) The idea is using rails. There will be some holders at +/- 30º (vertically). The rails...
  5. drodrig

    Aluminum alloy for plate under vacuum

    Hi there, I am looking for an aluminium alloy with a high yield strength for an end plate for a vacuum chamber (it has to take 1 bar - 14.5 psi) The outer diameter is 2500mm (8.2 ft) The thickness is what I am trying to determinate (between 50 and 25mm / 1 inch-0.5 inch) What alloy would you...
  6. drodrig

    Manifold (distributor) for cooling

    Hi there, We have to cool down some system at -30C/-22F. We are using ethanol. In order to distribute the coolant in the different sections we want to build a manifold using Swagelok connectors. First I thought about taking an stainless steel pipe, cut it and weld some caps with threaded...
  7. drodrig

    Turning a system by 90º part 2

    thread404-468702 Hi, We have already build the turning device. The post where I asked is closed https://www.eng-tips.com/viewthread.cfm?qid=468702 I just wanted to share some pictures and say thanks to everybody cheers,
  8. drodrig

    Eye bolt contacting area

    Hi there, We have to lift a heavy plate, it has existing threaded holes to screw in eye bolts. The thread is an M64, but it is counterbored with a diameter of 80mm and the counterbored surface is not flat. The contact area of the M64 eyebolt is 120mm. So the surfaces touching are from 80 to...
  9. drodrig

    42CRMO4V treatments

    Hi there, I am looking for a high strength steel to make a shaft and some holding plates. We can get 42CRMO4V, which seems to have very good properties, but it has to be heat treated. I've never done this before, so I would like how to proceed. If I find somebody to do the heat process...
  10. drodrig

    Corrosion? in aluminium plate

    Hi there, We have recived a machined plate from a manufacturer. It has some funny stains on one surface. Here some pictures It is aluminium 7570, 45mm thick These stains are only on one face. It seems they have roughly milled the top and bottom faces (I guess to get to the 45mm) and then...
  11. drodrig

    Stamping a 2mm aluminium plate

    Hi there, We have a 2mm 6060 aluminium plate helping to cool some elements. In order to reach these elements we plan to stamp it where they can be in contact (plate and elements). How can I know how deep can we stamp it? We want to go down by 5mm. The stamps are squares with a side of 28mm...
  12. drodrig

    Bearing Load Rating static

    Hi there, I come with a basic question. I have checked in google but I'm still confused. We have a load of 10kN. It is supported on both sides with block bearings. So 5kN per bearing. 500kp We just want to to rotate it 180º. Slowly. Not often. Checking from a catalogue...
  13. drodrig

    How to clean carbon fiber cut parts

    Hi, We are going to cut with a circular saw some carbon fiber reinforced epoxy parts. There is little dust after the cut. How can we clean them? Just water? Some additional product? thanks regards,
  14. drodrig

    Simple 300 micron sheet

    Hi there, We tried to make a simple plate 300 micron thick sheet using two prepreg layers (SIGRAPREG® C W205-TW2/2-E323/43%). They were pressed with two aluminium plates (15mm thick) and 8 M16 screws. They are 50x40cm2 (20x15 inches2) The result was insatisfactory. There is a middle strip...
  15. drodrig

    Connecting (soldering?) aluminium sheet and pipe

    Hi there, We are designing a cooling shell (ethanol, at -25ºC / -13ºF). It consists of a pipe 10/8mm and an aluminium sheet (as thin as possible: 1 or 2 mm) Here some pictures of the current design: The sheet is ca. 800mm / 30inches (maximum length) The pipe will (probably) be AW 6082...
  16. drodrig

    Galvanic corrosion between Aluminium and carbon fiber

    Hi there, I've been reading a bit in the forum and internet about the galvanic corrosion between aluminium. We have a carbon fiber reinforced epoxy boxes with a load and they are hung in one end. We glue an aluminium insert. The gap is 150 microns around and the glue 3M DP 410. In theory...
  17. drodrig

    Aluminium cooling shell manufacturing

    Hi there, We want to build a cooling shell to get as close as possible to our cooled elements (step shape). It is made of aluminium plates (~20mm thick) bolted together. They will be drilled with two holes each. There is no much space in the front, so the idea is making a pocket to connect the...
  18. drodrig

    Turning a system by 90º

    Hi there, We have a load on a plate we want to turn by 90º. What is the best way to do this? I thought about using gears. Here the general idea: We have this grey plate in horizontal position: We mount the load on the top (just a block to simplify the representation): We attache four...
  19. drodrig

    Dividing a closing shell in half

    Hi there, We have a closing aluminium shell. It is connected on an aluminium plate using screws and an o-ring. Inside there is a nitrogen atmosphere, overpressure, like 20mbar. We might change the shell to plastic. We have tested this, no problem. We would like to divide the shell into two...
  20. drodrig

    Surface roughness symbol (in drawings)

    Hi there, I got some parts machined from the workshop. In the drawings, I have detailed the surface roughness: 0.1 with the "tick" symbol. The parts are rough, I can fill the valleys/peaks with the nail. I'm thinking maybe I was not accurate enough with the drawing. Attached a capture. Should...

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