Where to get Free Engineering Drawings/Models/Assemblies? Few I know are Grabcad, 3D3dcontentcentral, Tracepartsonline. Share additional sites.

http://www.mcmaster.com/

http://www.3dcontentcentral.com/default.aspx

http://www.tracepartsonline.net/

http://www.carrlane.com/

https://grabcad.com/

http://www.solidprofessor.com/

LearnSolidWorks.com

My.SolidWorks.com

http://www.3dcontentcentral.com/

just go to (scribd.com) and login with your facebook id

www.arcat.com 

www.bibliocad.com

www.cadforum.cz

www.cadblocksfree.com

www.freedwg.eu

www.mycadsite.com

mcmastercarr.com, tracepartsonline are the ones I use extensively. Then again most of the OEM manufacturers like FAG, SFK, DEMAG etc. have online catalogues offering3D models online

2004 -2006     Master degree in petroleum reservoir engineering,  Amir kabir University –(Tehran).

      B.S petroleum engineering, Abadan institute of  technology-     (ahwaz).

google sketchup, works easy, you can convert it to2D autocad

www.google.com has all options can search more results.

All the above sites are having good library but some of them have registrations and some are paid too.