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Tutorial on modeling tapered spring in Creo Elements pro aka Pro Engineer wildfire.
Here is the tutorial.
Step 1
Insert >> Helical Sweep >> Protusion.
Step 2
Select Top plane.
Step 3
Draw a center line about the vertical axis.
Step 4
Draw an inclined line like this.
Step 5
Exit the sketch and define the pitch value. Click OK.
Step 6
Define the cross-section of the spring and click OK.
Step 7
We have spring generated.