Check out this URL in my THMShop blog: http://thmsblog.tedatum.com/?p=924
I just finished installing a Digital Read Out (DRO) on my machine shop milling machine. The link to my other blog will tell you how to see the four page report and the about 80 pictures I took when I installed the DRO.
This device will alow me to perform accurate machining much easier than before. A DRO has been state-of-the-art in manual machine tools for years.