DIY CMM ??

For both personal and very limited work use (once a month) ,
I'd like to have a CMM, but due to cost it is not feasible to have
a "real" CMM
(Coordinate Measuring Machine)
So has anyone built one that would be fairly accurate in the .001"
to .0005" range.
My parts are normally in the envelope of no bigger than 18" x 18" x
18".
I'm also in the planning stages of building a 4-axis DRO on my 3-in-1
using the board kit from Camtronics, so if I could some how use the
same computer and
modified software that would be great. Am I asking for too much ?



Thanks,
Mike Mueller
Antioch, CA