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The concept of drawing units were not well thought out in the original implementation of AutoCAD. As a result drawings unit are a messy concept with AutoCAD.
I find it useful to think that the primary unit for an AutoCAD drawing or model is an AutoCAD unit. Whether that AutoCAD unit represents an inch, foot, mm, meter, or even a parsec is, to a great extent, in the mind of the user (the units of the paper used for plotting can also be a factor when printing). Let's assume you are starting a new drawing and you are thinking "inches". You draw a line 1 (unit) long. You then give the DWGUNITS command and change to feet. The drawing is scaled and the line become shorter with a length of -.0833 units (1/12 as long). Now, an AutoCAD unit represents a foot not an inch. DWGUNITS is not so much setting the current units but scaling what's in your drawing. If you give the DWGUNITS command and do not change the drawing unit but change some other parameter (e.g., displayed precision), no scaling is done.
Lee