Re: [ATM] Field derotator

[martin.cibulski@t-online.de]

> At 2005-03-29 09:18 -0500, Jonathan Lavoie wrote:
> 
> I searched on making a field derotator but found not
> much information.
> Can you point me to webpages on the subject if there is?
> This is for my 
> 16" RC under construction with Mel's stepper drive.


Jonathan,

some day I want to built a derotator for my 14" dobsonian telescope
too.

Because I want to use only simple tools it should be a simple
construction.

The main part of my derotator will be a large toothed wheel made from
aluminum sheet material.
A stepper with a threaded rod will rotate the disk (worm and wheel
gear).
The disk will rotate around a large ball bearing and have additional
support near its edges from three small bearings.

I have a picture of my idea at:
http://www.martin-cibulski.de/atm/images/derotator.gif

Will this design work and be stable enough ?
Any comments or improvements are welcome.
If you want to add/change in the drawing, the original PPT file is also
there:
http://www.martin-cibulski.de/atm/images/derotator.ppt


Regards,
Martin Cibulski
_______________________________________________
ATM mailing list http://www.atmlist.net/