[ATM] Focuser speed reducer

[GARY FUCHS]

Don,

Could you explain more about the "zero backlash nuts". I'm working on a focuser that would benefit from them - it's strictly for personal use!

Thank you,

Gary Fuchs




>
>I don't use or need speed reducers. Just use a single fine pitch leadscrew
>with zero backlash nuts.  The advantage is no backlash or play from an added
>gear (or similar type) reduction mechanism. There is also excellent
>repeatability and ultra-smooth movement because the leadscrew nuts average
>over many threads and have a very large contact area. Of course fine focus
>is inherent with leadscrew focusing whereas the Crayford design has  the
>inherent coarse focusing limitation in which a focus reduction mechanism
>must be added for any type of fine focus. Also the contact area of the
>Crayford is very small, a point or line contact at best so there is also a
>limitation on maximum load before slipping occurs.
>
>
>
>Don Clement
>
>Running Springs, California
>
>
>
>
>
>> I've seen lots of great focuser plans out there, but I've never seen
>> plans or even a commercial source for a speed reducer like the ones used
>> on feathertouch and moonlite focusers to get dual speed focusing.
>> Anybody have plans or a source for such a beast?
>>
>> Thanks, and clear skies!
>> -- 
>> Michael Lindner
>> http://www.starastronomy.org *** http://home.att.net/~mikel
>> http://www.atmsite.org *** http://www.atmlist.net
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>
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