Boss/Base Sweep Feature

Go to: File > New > Part
Create a 2D sketch
Select the Top Plane in the feature tree (menu at the left side) and create a sketch by clicking on the 2D Sketch icon 
The display changes so the Top plane faces you.

Create a Spline
Go to Tools > Sketch Entities > Spline or click at the spline icon 
Create a spline starting at the Origin as shown in the picture. 
Click at the Sketch button in the upper right corner close the 2D Sketch 

Create a New Plane
Make a Plane perpendicular to the endpoint of the spline
Go to Insert > Reference Geometry > Plane or click at the Plane icon 
Select the Endpoint of the Spline as First Reference
Select the Spline itself as Second Reference
Click OK 

Create a 2D sketch on Plane1
Select the new Plane1 in the feature tree and create a sketch by clicking on the 2D Sketch icon. 

Create a Circle
Go to Tools > Sketch Entities > Circle or click at the circle icon 
Start the midpoint of the circle at the endpoint of the spline
Click at the Sketch button in the upper right corner close the 2D Sketch  

Create a Swept Boss/Base
Go to: Insert > Boss/Base > Sweep or click at the Sweep icon 
Profile : Select the blue Sketch2
Path : Select the pink Sketch1

It’s possible to keep the Profile sketch Normal to the start direction if you wish
To enable this click at the Options menu and change the Orientation/twist type into Keep normal constant
There are many other options in the Sweep menubar such as the Follow Path and 1^st Guide Curve / Follow 1^st and 2^nd Guide Curves / Twist Along Path and Twist Along Path with Normal Constant. 
The best way to discover these options is to try and notice what happens with the sweep.

You can also make a hollow sweep with the Thin Feature
Just select the Thin Feature option in the Sweep menubar and change the Thickness of the wall

Click OK 

I hope you’ve learned something about the Sweep Feature. Do you like my tips? Feel free to share them with your friends!