Tutorial to use coil feature in Autodesk Inventor.
Invoke a sketch in Inventor. Sketch a vertical line which would be the axis and a profile(circle in this case). Finish the sketch.
Click on coil.
Select the appropriate parameters.
Switch to "coil size".Select the type according to your choice. Change the no. of revolution.
Provide a taper angle if your design requires this.
Providing a higher taper angle increases the taperness of the coil.
This is the result of providing the negative taper angle.
Switch to "coil ends" and select the parameters.
This is the result of using previous parameters.