figure1(final model)
Step1:Establish a new model,name spring.prt
Step2:Create helix as shown in figure 2
(1)Click 
,curve ,helix,Popping the dialog box of "helix"
(2)Input the parameters like in figure 3,Click 
figure 2 figure 3
Step3:Create sketch 1 as shown in figure 4
(1)Click 
,
,Popping the dialog box of "create sketch"
(2)Choose XC-ZC as sketch plane,click
(3)Create sketch as figure 5
(4)Click 
figure 4 figure 5
Step4:Create sweep feature as shown in figure 6
figure 6
(1)Click ,sweep ,sweep along guide,Popping the dialog box of "sweep along guide"
(2)Choose sketch 1 as section,and choose the helix as guide.
http://www.cadfamily.com/html/Article/Spring%20in%20UG_NX_710_1.htm
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