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Thread: Cern

  1. #76
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  2. #77
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    Silicon?
    Molybdenum?
    Not exactly sure about the color.

  3. #78
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    Yes i have some of it in my shed, i think most of us would......but the bit i have isn't the same colour as in the photo's.....
    (yes i cheated, fascinating read Ray, not that i have got to it all yet)
    10um over 200m, now that is straight!

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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    Surely not concrete?

    Michael

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    Quote Originally Posted by Michael G View Post
    Surely not concrete?
    nope.

    Colors can be tricky. Think carbon, black one way, grey another, stack it up just right and its clear........
    But it was just a guess based on "stiffer than cast iron and lower thermal expansion coefficient than granite" and I'm not even such I got that much right lol

    Stuart

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    Tungsten carbide

    Phil

  7. #82
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    Both Stu and Phil, you are so close but so far......
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  8. #83
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    My last guess might be Titanium?

  9. #84
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    Silicon carbide...maybe

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    Quote Originally Posted by Steamwhisperer View Post
    Silicon carbide...maybe

    Give that man a cigar... Silicon Carbide girders it is.. This pdf is slightly out of date, but the main design features are still current, it's such a long term project, that I've no doubt things will change even more over the years.. they even take into account the effect of the moon's tidal forces causing ground movement, and the way local variations in gravity affect the wire sag tables..

    http://clic-alignment.web.cern.ch/cl...for%20CLIC.pdf

    Has anyone done an active lathe alignment system I wonder?

    Regards
    Ray

  11. #86
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    That was my next guess
    Do Phil and I get half a point each? lol


    Quote Originally Posted by RayG View Post
    Has anyone done an active lathe alignment system I wonder?
    I have, but the sample rate is a little slow at 0.00000007hz (an attempt at humor in an thread that goes over my head fairly often). Though the parts I've read about the wire are interesting. Anyone know what a knife-edge pulley is?

    Stuart

  12. #87
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    Woo Hoo!!
    Ya know I would love to say I knew it all along but we were just running out of materials

    Physics Phil

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    Quote Originally Posted by Stustoys View Post
    That was my next guess
    Do Phil and I get half a point each? lol



    I have, but the sample rate is a little slow at 0.00000007hz (an attempt at humor in an thread that goes over my head fairly often). Though the parts I've read about the wire are interesting. Anyone know what a knife-edge pulley is?

    Stuart
    Hi Stuart, once every 165 days... not quite real time. I'm curious about the knife edge pulley thing, all I can guess is it's some kind of low friction low movement thing?

    Here's a few more pictures of that area.

    This is one of the actuators
    IMG_0405s.JPG

    The silicon carbide girder structure
    IMG_0406s.JPGIMG_0407s.JPG

    The wire system, with counter weight, and that red pulley assembly must be the "knife edge pulley"
    IMG_0408s.JPG

    Regards
    Ray

  14. #89
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    Quote Originally Posted by Steamwhisperer View Post
    Silicon carbide...maybe
    Woot! 10 Points..... well done.

    Quote Originally Posted by RayG View Post
    Has anyone done an active lathe alignment system I wonder?
    Livermore's LODTM lathe would be the closest to a active compensation lathe, with 7 laser interferometers maintaining tool position relative to a super invar reference frame, now that's a DRO!

    Quote Originally Posted by Stustoys View Post
    That was my next guess
    Do Phil and I get half a point each? lol

    I have, but the sample rate is a little slow at 0.00000007hz (an attempt at humor in an thread that goes over my head fairly often). Though the parts I've read about the wire are interesting. Anyone know what a knife-edge pulley is?

    Stuart
    lol, that's at least 2 twice my sample rate.

    I have some more photos of the knife edge pulley system for the LHC dipoles.
    IMG_1671.jpg
    HighRes
    IMG_1672.jpg
    HighRes
    IMG_1673.jpg
    HighRes
    IMG_1674.jpg
    HighRes
    IMG_1675.jpg
    HighRes
    IMG_1676.jpg
    HighRes

  15. #90
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    Thanks for the pictures guys, that clears things up(though they seem to have a problem with the power feed on their lathe, interesting pattern.)

    Mine wire mounts certainly arent as that pretty.

    Stuart

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