A course for modeling AutoCAD mechanical Bearings

Yesterday, I saw the works of the elders, a friend asked how to draw. Yesterday in the Post reply method is not too detailed, now release detailed methods, 赟 elders don't blame me

First look at the final effect:

The 1th step is to draw a graph

The 2nd step is to use interrupts or pruning

Modified into the diagram. Suggest interrupting or trimming with a little less skilled practice.

Step 3rd Transformation Surface Field

Command path: Drawing < surface fields

Step 4th offset Red line, distance 20