AutoCAD

I started this sprocket for AutoCAD on the website called braimbuffet. I helped finish the sketch by using the purple target points as references for different types of circular arches and the circles, then the big circle in the middle.   

I created this illustration by using the midpoint to create the inner box inside the cube, and then I continued to use hach to make the shading on the square and the outer cube to create this illusion.