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    JVC's Avatar
    JVC Posts: 1, Reputation: 1
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    #1

    Mar 31, 2007, 10:34 AM
    Triq, diameter of circles about a circle
    How do I determine the minimum outside diameter of a group of 7 wires of .150 OD that are arranged in a circle and touching each other around a center core.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Mar 31, 2007, 10:49 AM
    I would think it would be 0.45
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #3

    Mar 31, 2007, 10:55 AM


    Proved as the smallest possible packing of 7 circles into a larger circle, by Graham in 1968.

    If the interior circles have d=1 then total d = 3 (as can obviouslyt be seen)

    It gets much more interesting above 7 :)
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    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Mar 31, 2007, 11:46 AM
    Erich's Packing Center

    Ridiculously interesting site.
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    Capuchin Posts: 5,255, Reputation: 656
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    #5

    Apr 3, 2007, 11:52 AM
    Quote Originally Posted by JVC
    Thanks for the help but I meant 7 wires in a circle around a central wire, so 8 wires in total
    Jvc! Always better if you reply here! :)

    If you had looked at the website I stated, it gives the answer:



    d = 3.304*.15 = ~0.5 (0.4965)
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