To spend simply a circle on a plane costs nothing with the help of a compass. But what if this line should cover a cylindrical billet? For a rough layout, you can use string or a rubber ring. The marking will be more accurate if the workpiece perpendicular to lower the fluid: boundary wetting will become the desired line. Another option is to wear to the cylinder tube of suitable diameter or wrap it with a strip of paper, foil.
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I live in Siberia and have been fond of hunting and fishing for a long time. Our places are wonderful. There are many rivers and lakes rich in fish and game. I love hunting waterfowl...
