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  1. vacuumsage

    Seam welding stainless steel foil

    Does anybody know of a supplier of equipment that can be used to seam weld foil pouches? I am assuming that some kind of resistance welder with rotating wheels would do the job. Many thanks
  2. vacuumsage

    hard anodized aluminum in high-vacuum?

    I don't know about carrying off the sealant, that doesn't sound too plausible, but if you are in aerospace and this is a coating application, you run a very high chance that the outgassing water vapour (and there will be plenty of that if you are trying to get below 2.0X10-5 torr) will either...
  3. vacuumsage

    hard anodized aluminum in high-vacuum?

    jimmetalsceramics and irstuff are quite right, but you are only attempting to get down to 3X10-5, and that is not very difficult, especially if you have a big enough pump. If you haven't bought your linear guide yet though you might want to consider finding something else. It's better in the...
  4. vacuumsage

    finishing Ti surfaces for UHV

    I have been giving this some thought, and I am concerned about the ability of a getter alone to reduce the pressure from the 1E-3 range to 1E-7. I have never tried that myself, though I have used getters to maintain that level of vacuum once pumped down by other means. However I don't have any...
  5. vacuumsage

    finishing Ti surfaces for UHV

    It really depends on the level of vacuum you want to achieve. You specify UHV so I am assuming 10E-9 torr or better. Cleanliness is essential, no oil or grease is permissible of course, so a thorough hot degrease would be good. Polishing is essential on sealing surfaces. O ring seals work fine...
  6. vacuumsage

    Plating on plastic material

    Check out www.segroupinc.net for a company called "the surface engineering group" they specialise in arc deposition, and can coat parts for trials and production, and can also build any size system for you should you wish to make your own coatings. They are a small company, but have...
  7. vacuumsage

    leak rates for pinch-off tubes

    I don't have any numbers to hand, but can offer some small reassurance that the pinch off system works (I'm assuming it's an OFHC copper tube of extreme cleanliness). This same system is used to seal off electron tubes of various types before being put into storage. There are many applications...
  8. vacuumsage

    US standard fastener sizes

    Look for UNC threads - these are the most commonly used. Although you say you don't want to buy a book, the handy zeus pocket book has lots of info in it, is based around UK engineering needs and also has the UNC and UNF thread series info in it (because they are English in origin). It's only a...
  9. vacuumsage

    Shakeable vacuum chamber

    T6061 is a commonly used aluminium alloy for vacuum chambers and tooling, it has good machineability and weldability, so it is quite easy to work with. I have never done anything like this, but I have had chambers shipped across the country (USA) on trucks under vacuum, with gate valves on, and...
  10. vacuumsage

    Plating on plastic material

    You might like to consider arc evaporation on top of your chrome coat (this is another vacuum plating technique) it is very tough and is used to deposit decorative coatings on a wide range of plastics, including external automotive and marine parts, so it stands up to the elements pretty well...
  11. vacuumsage

    ball bearings for vacuum applications

    Hello There are a couple of lubricants on the market that have been developed for vacuum use. I have used both Krytox and Torrlube. Your local vacuum vendors should be able to supply these. If your coating is done at high temperature, another possibility may be to try Dichronite - this is...
  12. vacuumsage

    Vacuum Chamber

    I am in fact the one who was advising Biggadike. It sounds like you are matching the size of the test chamber closely to the device. In this case, if the device is mounted intimately to the base or wall of the chamber, then it would make sense to use that wall of the chamber to provide heating...

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