RE: ATM Backlash on azimuth axis

["Damien Van Holm" <Damien.Van.Holm@orange.be>]

Hi Ken,

I thing that it's probably my bearings in azimuth who are a little too stiff
because it's bearings of 2" of diameter and they are protected against water
with a plastic washer who can probably retain the outside bearing.

Anyway, a friend have the book you speak and I'll have a look on it to check all
stuffs who can produce this disagreement...

Thanks for the tips.

Damien





Please respond to "Ken Bertapelle" <kenb@cqg.com>

To:   Damien Van Holm/EN/Kpn-Orange@Kpn-Orange, atm@shore.net
cc:

Subject:  RE: ATM Backlash on azimuth axis


Hello Damian,

A couple possibilities come to mind regarding your backlash.  The
first is rigidity throughout the optical assembly.  Lack of rigidity
can creep into the scope in a number of places - flexure of the
mirror box, the tube (or truss system), and the interface between
the upper assembly and the mirror box.  Another thing to check is
the azimuth bearing - if it is too stiff it can contribute to
backlash.  Together, these two problems combine to aggravate the
backlash problem.

There's an excellent discussion of all this in the book by Kriege
& Berry, which you should probably look over.  Clear skies.

- Ken Bertapelle