Re: [ATM] Equatorial platforms, 1 rpm motors, and First light

[Jarvis Krumbein <jkoptic@juno.com>]

On Wed, 26 Jul 2006 20:32:31 -0400 "Russell Jocoy"
<russjocoy@hotmail.com> writes:

Hi Russ,

There are two things to consider.  First, how long a period of time do
you want the platform to track?  The answer to this will determine how
long the arc must be.  On my own platform, I've settled on 1 1/2 hours
total from one end of travel to the other although I only use about an
hour for most observing.  The second point to consider is where is the
center of gravity of the DOB when mounted on the platform.  Ideally, it
should be at a height so that the polar axis passes through the same
point or close to it.  On my own platform the polar axis is very slightly
above the CG so that I can uncouple the drive when resetting and not have
to worry that a top heavy scope will fall over if I'm not careful.  If
you take both these things into account, you will know where to slice off
the curve.

If I can be of any further help, feel free to let me know.

Jarvis Krumbein

> I have done the math, I know my lattitude, I have cut the "radius 
> curves for 
> the size base of my DOB, both "north" and "south"... I have a 
> question.... 
> where do I slice off the top of this curve?
> I know the distance between these two curved bearings, but to my 
> understanding the base to the ground is level to all directions, and 
> the 
> "rocker" or "DOB" base should be level to the ground base North and 
> South  
> since the east and west follows (or compensates) the earth's 
> rotation.
>        Do I set the two curved radius's  at my base width  and level 
> them at 
> any elevation I need???
> I would like the least increase in elevation as possible. I do 
> understand 
> that these curved "bearings"
> reflect the lattitude and are facing toward the south at that 
> angle.. My 
> question comes down to is what measure should  the deepest part of 
> these 
> curves be? both north and south. They can"t be the same  , can they? 
>  I have 
> loaded way to much information for one listing and will talk about 1 
> RPM 
> motors later, of course they are related to the drive of this EQ 
> platformonster...
>                                      Russ Jocoy
>
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