Tutorial to design 3D AcME Bolt in autocad

this video explains clearly step by step procedure of making ACME bolt.
https://www.youtube.com/watch?v=Gghnbkio4hg
or
http://sourcecad.blogspot.in/2014/04/designing-complete-acme-3d-bolt-in.html
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Step 1:
this will be the final rendered image of acme bolt
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Step 2:
use this 2d layout to draw bolt.