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

["Jan van Gastel" <jhm.vangastel@wanadoo.nl>]

Martin,

Maybe mounting one or two rollers or rollerskatebearings to the side of the
rocker, riding against the side(s) of the mirrorbox will help. Here is
example of what I mean:
http://overton.tamu.edu/aset/krajci/molded-worm/molded-worm.htm , on the
third and fourth picture.

Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/


----- Original Message ----- 
From: <martin.cibulski@t-online.de>
To: <atm@atmlist.net>
Sent: Thursday, January 06, 2005 1:28 PM
Subject: [ATM] Alt/Az goto scope, lateral shift when moving up/down


> 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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