Re: [ATM] Illuminated field question

["Don Clement" <don_clement@charter.net>]

> For doing a large movement, a pair of linear motion bearing sets
> will be the ticket.  Attach one to the frame of the main scope
> and the other at right angles to the first bearing.  A simple
> screw with a half nut will allow for coarse and fine location of
> the end of the scope in the X and Y directions easilly.

Bob,

 I don't understand how the linear bearing sets fit? Are they parallel,
perpendicular, or at some angle to the main scope  optical axis?



Here is a picture of an old Guide Scope Positioner I had laying around:
http://i72.photobucket.com/albums/i163/miltons_stuff/guide_positoner.jpg



The design of this positioner is fraught with areas where flexure and
bearing slop can affect guiding accuracy, most notable is the use of plain
bearings where slop occurs and the need to lock the position adjustments
down.



My compliant three triangular plate guide scope positioner eliminates all of
these problems. The use of split-crossed flexures eliminates any bearing
slop. Independent adjustment of X-Y axis is by two spring-loaded knobs so
there is no need to lock down anything. There is no stiction with the
compliant flexures. Ultra-smooth movement of the adjustment screws and
position of the guide scope stays put after the adjustment knobs are
released without needing to lock down. The positioner takes up less than
1-1/2" of height.



Don Clement

Running Springs, California
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