Free Design Computer Program?

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I have a tinkering problem. I like to design things before i build them not guess and check. I was wondering if anyone has found any programs on the internet that are Simular to cad or anything else that you can do calc's and layouts in and yes FREE is what i am looking for.-Lifes short, WELD NAKED!
Reply:Try this:http://www.hobartwelders.com/weldtal...ad.php?t=27210We want to see something like this in the signature line:Lincoln Ranger 250Miller Auto-Darkening Elite HelmetLincoln 100Lincoln MigMiller Spectrum 375Craftsman 8 galllon gas powered compressorLongevity 200amp Tig Welder LT-200D
Reply:Try Sketchup from Google (free 3D surface modeling... very useful)Or Try.. http://www.plm.automation.siemens.co...2d/index.shtml  Free 2D cad solution from Solid Edge.
Reply:i think sketchup is your best bet
Reply:UPDATE:i Tried the one from google it was not free. I found two really good ones though after several failed attempts. The two i found:Juscad8.0 Very neat program not easy to use lots of options havent figured it all out yet.Cadstd.-Very very easy to use had it figured out in no time although it does not have as many features as Justcad8.0Thanks guys
Reply:SketchUp is free, sketchup PRO isnt free, go to the link and look at the last selection, Google SketchUp 7, free!http://sketchup.google.com/download/If you cannot convince them, confuse them.         Harry S Truman