Recently, I had a brain storm about finding the straight axis of a bent chair part. In my recent work, being able to register the axis of a bent piece has become increasingly important. So to ease my way, I thought of a method for marking the center of a bent piece, quickly and accurately.
As you can see below, when you look at the piece so that the line is closest to you, the piece is split evenly and looks straight.
But as you see here, the piece has a curve.
By aligning this line with my sight line, I can use it as a reference to get the angle correct and very importantly, the rotation. Unlike straight parts, the rotation plays a huge role in positioning a bent part.
Of course a chair like the one below has oodles of complex reaming and positioning. I hope to go into this more later.
So here's the challenge. Before I tell you my idea, I want yours. How would you go about accurately marking the center axis of a bent piece? Remember, some pieces are bent in more than one direction like the one below (but only in one plane, for now!).
So think it over, stay up all night, drink 12 cups of coffee, climb a mountain and meditate...Whatever it takes, who knows, your idea might be a lot better than mine! I'll post the top three (IMHO) methods.