How to make a 90-degree elbow with a diameter of 200 mm? What's the easiest way?

1. Draw a front view and determine the number of elbows; Calculate the angle of the first part.

2. Draw a plan and divide the plan into 12 equal parts.

3. Take the bisector of 12 in the top view as the angle line where the vertical line intersects with the first paragraph.

4. Draw the development diagram L = 3.14d; And bisect l into 12.

5. Measure 1 in the main view and translate it until the expanded view is 1. In this way, the remaining line segments are translated and connected with smooth curves to get the first segment.

6. Other n sections do not need to be re-lofting. Just use the first segment as a template and reverse the template to get the remaining n segments.