RE: ATM The Big Dob Two-Step (-per drive)

[PFAFF2@delphi.com (Robert C. Pfaff)]

>At 06:45 PM 2/3/97 -0800, you wrote:
>>Backlash is not a problem with worm gears. If the worm is spring loaded
>>against the worm gear the is NO  BACKLASH. I have used this system.
>>Byers and Celsetron also use this system now.
>
>Can you show me a drawing or picture of how the spring is used ???  I am
>finding this thread quite useful... But I am having some difficulty
>visualizing this arrangement.  It sounds simple, and that just makes it all
>the more frustrating...
>
>Bob Segrest
>

To get a picture of a spring loaded worm you might check out Sky and Tel
July 1989 page 100 A Double-Curved-Bolt Drive. Although this worm is 
loaded against a sector made of curved threaded stock the principle
is the same. My picture does not show the loading spring which is on the
right side or motor side. I used a tension spring but a compression
spring on the under side will also work.

Hope this helps 

Bob Pfaff