How to draw 2d spring in autocad

step 1. :
helix in command line

step 2:
specify the center point of base of the spring your going to draw
step 3:
specify the base radius or Diameter of the spring
step 4:
specify the top radius of spring.. it'll same value unless your spring is of conical shape

step 5:
specify height of the spring

step 6:
to see the spring you have drawn in isometric views.. type 3d orbit
and enter..
now rotate the drawing with help of your mouse..

Enjoy... :)