Let's start with the sketch of the keychain frame. My sketch looks like this. You are welcome to take it over or make some changes for your own design.
Once you are happy with your sketch we can start and build some parts using "Extrude". Let's start with the outer rim and extrude it 8mm using Symmetric.Next we extrude the upper circular shape with 4mm, symmetric.
Now it is time to add the frame support structure at the back of the fame. The way I did this was to ...
The result should look like this
We can start now with the cylinder for the rotation. Start a new sketch on the face of the support structure, draw a circle in the center with a 4mm diameter and extrude the circle out using "Up to face"The result should look like this. (I applied already a fillet)
Very good! The keychain frame is completed now, let's move on to the propeller design.
In order for the propeller to rotate freely we need to give it some space. Let's start with another sketch on the face of the support structure and draw two circles (I choose a distance and thickness of 0.7mm)
Now Extrude the shape out by 4mm. With this done we can start with the blades! The blades need to be in the middle of the rotating axis. In order to achieve this we need to add a "Mid Plane" using the front - and back face of the rotating axis.Once the plane is in place we can sketch the blade.The result should look like this.
Extrude the blade out using 1mm, symmetric. In order to give the blade the typical shape we need to apply a "Draft". Hide the frame for better visibility of the blade and apply the draft tool with an angel of 25 deg.
Now that we have one blade in shape, we can make copies of it. The best way to do this is to use the "circular pattern" tool. Select the blade, use the circle as rotating axis and make 6 copies with 60 deg for one full circle (360 deg).The result should look like this.
Great work! At this point you should have all the knowledge to complete the reset of the model yourself. You need to design a cap that holds the blade in place and apply some fillets at the end. My final result looks like this.
The model is also public on Onshape and can be found here.
