Re: [ATM] ground ring diameter vs. mirror diameter

[Dave Smith <smithersscope@yahoo.com>]

Thanks to everyone that responded to my question. I've
begun the rebuild. For those that might be interested
or find interest in this thread somewhere down the
road I'll add one other observation. On my first
iteration of the 16 inch tri-dob, I tried "too" hard
to keep the footprint small. So much so that I didn't
leave myself enough room inside the mirror box to work
with. So, John's comments are correct. Design the
mirror box first with all your requirements included,
then build the ground ring and flex rocker to match.
It just sounds ironic that you need a footprint
roughly twice as large as the mirror diameter! 
Thanks,
Dave
--- John Sherman <atmer@johnspics.com> wrote:

> 
> 
> Hi Dave,
> 
> > ring and flex rocker...can you comment on the
> ratio
> > of ground ring to mirror size?
> 
> That sounds about right. I have a 40" ring under my
> 22" mirror. After you 
> build your mirror box, you build the rocker to fit.
> Then measure the 
> diagonal across the bottom of the rocker, and that
> is the diameter of the 
> ground ring. While it may sound huge, it doesn't
> really add to the dimension 
> of the scope as a whole, since the rocker will
> already use that amount of 
> space as the scope is moved in AZ.
> 
> Good luck with your project!
> 
> John
> 
> 
> 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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