Cheap and simple kind of read-out

Get this Noga holder:
https://www.amazon.com/NOGA-NogaFlex-Holder-Model-NF1018/dp/B0006J49MA
http://www.noga.com/Products/Center...s/NF1018/Centering_NF_holder_3|fs|8"_-_NF1018
Mount a DTI on it, install it in a collet, move the indicator so the dial is facing up and the stylus is down nearly enough to contact the table and well away from the spindle center, partly tighten the knob so it can be placed where you want it, move the indicator down until it just contacts the table and moves the indicator no more than a few thou, tighten the knob more firmly, and swing the indicator around the circle. It is facing up so you can read it easily around the full circle. Tram the head. Also tram the vise while you are at it. It works perfectly for that job as well.

This indicator holder is also perfect for centering holes on the mill, which is how it is advertised. It is quick and smooth and easy to use.
 
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