Tutorial: How to make engine part 43

SPRINGS
Step 1:
open a sketch on the top plane
Step 2:
draw a circle
Step 3:
exit from the sketch. add a helix
Step 4:
click on the circle
Step 5:
enter shown values
Step 6:
open plane command
Step 7:
click on te helix and helixes endpoint
Step 8:
open a sketch on the plane that you have created just before
Step 9:
draw a circle to the centre
Step 10:
use sweep command
next: http://grabcad.com/questions/tutorial-how-to-make-engine-part-44