Anyone build a balanced arm?

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Just wondering if someone has built a balanced, articulated arm, sort of like the picture below, but on a larger scale--to support a computer for instance?  I want to be able to move the arm around at will but to be balancedEssentially, I will be building a water table for my CNC machine, and the computer needs to be close/attached, but I want the freedom to move it around.  I have everything designed, except a way to balance the arm.  I would like to hear from anyone that has done this before.... or has good ideas on how to do it.I will have it upside-down compared to the picture of the lamp, and where there is a lamp, I will have a tray with a laptop mounted on it (and maybe my controller box too)Let me know if that doesn't make sense. Attached ImagesLast edited by jdh239; 01-05-2011 at 04:45 PM.The Lord has declared, "This is my work and my glory--to bring to pass the immortality and eternal life of man"  Moses 1:39Link: My name is John, and I am a member of The Church of Jesus Christ of Latter-Day Saints.-- ColdCreekWorks.com --
Reply:I saw a guy usin a ipad as the computer / pendent lol it just seems so much simpler to me but at one time u could find what u were looking for i just dont remember where they were tv mounts / monitor mountsI forgot how to change this.
Reply:I'd think that gets more difficult as the weight goes up.  Those springs on the lamp are just enough to allow the friction at the lamp's joints to keep it from falling.That, and a computer (or at least one with a fan) should be kept a distance from the plasma cutter (or anything that puts crap in the air).Why can't you place the computer on a shelf, and extend the wires from it?
Reply:Hmmm, water + plasma + dust + EMI + computer = computer problems  The best laid schemes ... Gang oft agley ...