On 30 November 2013 01:01, Gene Heskett <ghesk...@wdtv.com> wrote:

> But what then becomes the position feedback?

Ideally something high-count on the table itself. Such as a Renishaw Resolute.

For the smaller budget, an 18 pole motor with 6 hall phases and a 90:1
harmonic drive has 9720 phases per rev, and might be enough to work
with.
(half a minute resolution, so you would need to not be too fussy)

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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