jeff Member

  • Member since Jul 5th 2014
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  • jeff

    Post
    The repair parts for four bellows valves arrived today, and I wasted no time disassembling and cleaning the valves and installing the new valve seats. Before repairs it was impossible to pull better than 2e-5 vacuum. With the repairs I can get 1e-7 after…
  • jeff

    Post
    The vacuum system is put back together. There is now a valve between the forepump and the TM pump to prevent backflow. Right now I am testing just the vacuum system to determine how good a vacuum can be attained. The forepump can easily get down to a few…
  • jeff

    Post
    Two steps forward, one step back... The first attempt to operate the T/M pump yielded an acceptable vacuum on the range of 1e-8, as measured with an ionization gauge. At this time I decided to shut the system down for the day. Somehow during the shutdown…