Re: SEC: UNCLASSIFIED:- [ATM] Can a Trilateral Dob be computerOperated?

[Mark Holm <mdholm@telerama.com>]

Andrew.Martyn@defence.gov.au wrote:

> The issue I see is how to ensure that this fin is
> concentric with the other two outside bearings. If they are not concentric
> and of the same radius then you will not get accurate GOTO.

Concentric, yes, not only for driving, but for other use as well.  Same
radius?  No reason that needs to be true.

Just off the top of my head, the tolerances on concentricity may not be
that tight.  I may well be wrong here, but I think the main effect would
be a sort of wedging that would push the scope up and down as it
rotates.  Probably doesn't cause much angular error.

Anybody else have a clearer thought on this?

-- 
Mark Holm
mdholm@telerama.com

_______________________________________________
ATM mailing list http://www.atmlist.net/