Cycle Sprocket

I have started with the largest circle with a radius of 94.5mm. Next, a concentric circle with diameters of 32mm and 64mm is drawn. A vertical line is drawn from the center for 19mm, with an opening of 8mm in between (4mm on both sides), and it is connected above with another line. For the smaller circles of 8x5mm, they can be created using a polar array. However, an additional step is needed: draw a line from the center outward either to the left or right, then lift it by 30 degrees. Afterward, create a circle with dimensions of 8x12mm, where a polar array can be used to draw it over 120 degrees. Similarly, using a polar array, create a circle of 20x9mm, where unnecessary lines can be removed for a cleaner design. Project Source : https://1.bp.blogspot.com/-wHrGhLmMjt8/XzqOujzBb0I/AAAAAAAAxeA/Aa71DOxTMbssG5bc7Qi5a5EiTZZnYyTYgCLcBGAsYHQ/s2048/2D%2BCAD%2BEXERCISES%2B%2528WWW.STUDYCADCAM.COM%2529%2B844.png