I have a PC 690 base permanently mounted on my router table, and find it to be
very convenient and plenty accurate. The gradations on that measuring ring are
1/64", I can fine tune the cut depth or repeat a depth setting to better than
..005" (measured depth of cut in workpiece). It did help to make two more guide
lines (with a 'Sharpie' marker) on the body of the motor halfway between the two
that come from the factory - makes it easier to make sure one guide mark is
visible from the front when the router is mounted under the table.
--
JeffB
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http://home.san.rr.com/jeffnann