Re: ATM Kriege/Berry Dob book

[Bob Bond <rgb@ncube.com>]

One easy way to check your calculations is to scale the design so that one 
thickness of plywood is scaled to the thickness of a sheet of foam core 
board.  I think the stuff I used was 5mm thick.  Scale the rest of the 
dimensions, cut it out with an Exacto knife and glue it together.  You can 
use the model to check clearances, the silly "which of these is supposed to 
be 3/4" smaller" questions that are so easy to screw up, etc.  I made 
"truss tube poles" out of appropriately sized wooden dowels.  It's nice to 
check how the angles on the poles come out. The whole project took an 
afternoon.

One other thing - the model is a cool thing to have sitting on the shelf at 
work long after I finished the scope.  When people ask if I have a 
telescope I point to the model and say "it looks like that but it's 6 1/2 
feet tall".

                 Bob

At 08:20 AM 8/23/01 -0700, you wrote:

>On Thu, Aug 23, 2001 at 08:07:39AM +0100, Daniel Fundo wrote:
> > Ron, I don't have my copy at hand, but I think the tailgate
> > dimensions are for the size of the mirror box for a mirrrors
> > 12.5"/13.1" (15") and 16" (18").
>
>This would have explained a lot :) I double checked the book though,
>and indeed in the tailgate dimension table, the column in question is
>labeled "Aperature of Mirror".
>
>Some have pointed out that I can calculate these figures. Well duh,
>that's what I said in my original email :) And yes, in some cases the
>formula's are there -- in other cases it's only losely defined how to
>come up with the dimensions.
>
>This is my first big scope. I will make enough mistakes without a few
>calculations to screw up, and I was just confused why the book is so
>inconsistent in the area of mirror aperature and dimension tables. The
>other key missing data besides the tailgate are the recommended
>dimensions for the side bearings, and the rockerbox.
>
>Beyond that, it's an absolutely fantastic resource.
>rjf&