"UCS" user co-ordinate system allows you put your drawing plane on say any face of a 3d object
Simple you can set say a 90 rotation about x axis by UCS X 90, a more complicated ucs attached to a face by pick 3 points in a 3d view (set x axis set y).
The only trick to remember is you must type "plan" to make the new UCS the current darfting plane and you now look at at it square to the screen.
A good idea is to save the ucs setting for reuse UCS S. To return to normal view "UCS W PLAN"





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