Re: [ATM] Alt/Az goto scope, lateral shift when moving up/down

[Justin Modra <nitrohepcat@yahoo.com>]

I had a similar problem with my 10" Dob with teflon
bearings. The mirror box moves side to side when the
tube is rotated up and down.

There are at least two possible solutions, listed
below. Note, "bearings" could be ball bearings with
wheels, felt or teflon pads.

1. A second set of bearings on the inside of the
rocker box that contact the mirror box.

2. A set of bearings that mount on the outside of the
altitude bearings.


--- martin.cibulski@t-online.de wrote:

> Hi everbody,
> 
> I have a problem using my goto telescope:
> It is a dobsonian construction, instead of teflon
> pads it
> is supported by small ball bearings and driven by
> self made
> aluminum wheels and threaded rods used as worms.
> 
> Pictures can be seen at:
>
http://martin-cibulski.de/atm/scope_14_completed/index.htm
> 
> The problem is:
> When the tube moves up/down it moves a little
> sideways until
> the worm and wheel come out of contact.
> I tried to adjust the side bearings' positions and
> made the
> ball bearings as straight as I could but the problem
> is still there.
> 
> Are there any ideas how to prevent the tube from
> moving to the side ?
> 
> Regards,
> Martin Cibulski
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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