Re: ATM Building a Dobsonian, 2 Questions

[hermit <klowther@cisnet.com>]

Hugues.Laroche@ses-astra.com wrote:
> 
> Hi again,
> 
> I said, about variation around the lazy-susan:
> 
> > it is a large ball-bearing-based ring that a local company can supply
> 
> An image is worth thousand words so:
> 
> http://www.kaiserkraft.be/KKCT_LoadSections.process?Section_Id=1191
> 
> (it is in neerlandish but it is more or less self-explaining)
> 

Wouldn't come up in my browser.  I did the lazy susan once.  Remember,
anything will be magnified at the eyepiece.  The lazy susan had
'stiction' of a few degrees at least.  Very annonying when you only need
to go a quarter. ;-)  Then it took on some dew and started to rust. 
Even oil didn't help it much at this point.  At least not in terms of
telescope use.  It is still fine for what it was intended.  The ball
bearings were loose in the race.  Amazing how much better the
teflon/formica works.

Bottom line.  ANY little anomoly you noticeable at the eyepiece.  Make
sure there is NO  slop in the thing.  

Ken