Re: [ATM] New minimalist single-pole 18" ultralight

[Gary Seronik <gary8us@yahoo.com>]

Hi guys:

Not to take anything at all away from Ross's fabulous
looking scope, but I do want to point out that Francis
Milsom wrote up this modification in the July 2001
issue of S&T.  Check out "An Attractive Three-Point
Dobsonian" and have a look at Francis's gorgeous scope
and the "fork Dob" it rides on.

Gary Seronik

--- Mike Lockwood <melockwo@uiuc.edu> wrote:

> Hi,
> 
> Ross Sackett wrote:
> > I have posted some photos of my new single-pole
> 18"
> > f/4.3 Newt at
> > http://www.flickr.com/photos/8315630@N04/
> > The scope weighs 76 pounds, so it can be carried
> > around the yard.  It has a 3 point hybrid
> "dob-fork"
> > mounting, and the rocker latches to the mirror box
> so
> > that it can be moved as a unit.  The design
> evolved
> > from earlier 8" and 12" scopes I took to
> Stellafane
> > and the RTMC.
> 
> I'm glad someone built a mount like this (the
> "dob-fork" mount).  I 
> have sketches of a very similar mount, which I had
> intended for 
> another telescope or maybe my travel scope, but I
> never built it.
> 
> Only one bearing is required to provide the dob-like
> friction, and the 
> other pivot point can be quite simple.  For scopes
> with a low center 
> of gravity this saves the added complication of
> making another 
> bearing, and provides a more stable and rigid
> attachment point for an 
> altitude encoder.
> 
> Nice work Ross.
> 
> The "two Jupiter" flexure is interesting.  I recall
> similar flexure on 
> a friend's four-pole Teleport.  Do you know where
> the bulk of the 
> flexure is occurring?  What is the pole made of? 
> Aluminum?
> 
> 	Mike Lockwood
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 



      ____________________________________________________________________________________
Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center.
http://autos.yahoo.com/green_center/ 
_______________________________________________
ATM mailing list http://www.atmlist.net/