How to make belt

This is how to make belt

1. Step 1

   firstly open a sketch to front plane and draw four circle like this. distance between the circles will give the belt thickness
   
   

2. Step 2

   draw two line and make it tangent with circles
   
   

3. Step 3

   use mirror command and trim your sketch
   
   

4. Step 4

   extrude the sketch
   
   

5. Step 5

   open a sketch on the side of body and draw 2 circles like this
   
   

6. Step 6

   use trim command than extrude
   
   

7. Step 7

   use features>>circular pattern command
   
   

8. Step 8

   you have to skip some of bodies which are don't touch the belt. if you dont do this, you will get error
   
   

9. Step 9

   make same things for other side
   
   

10. Step 10

    draw your tooth profile again
    
    

11. Step 11

    extrude it and use features>>linear pattern command
    
    

12. Step 12

    use mirror command
    
    

13. Step 13

    your belt is ready. very simple:))