[header] How to set up an autocad drawing [title] Import or go to the autocad drawing that is not to scale. [step] It is okay if the autocad drawing is not to scale, as long as you know at least one length. Type in " un " followed by the space bar to change the units. 
Make sure the units are architectural and the precision is 1/6 ". [title] Identify one line segment in the drawing that you know the length of.