To obtain a cylindrical shape, markings are made of an octahedron, and gradually grind down to rounding. To obtain a conical shape, make four notches with a hacksaw and cut off the excess with a plane. The similarity lies in the fact that both cylindrical and conical parts at the stage of finishing are first performed with a sanding block, and then with a sanding cloth in circular and longitudinal movements.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.