Re: [ATM] Looking for information on a telescope design

[Jarvis Krumbein <jkoptic@juno.com>]

It's time to stop trying to reinvent the wheel.  This sounds like a job
for "Super-, I mean Springfield Mount Man".  Refer back to the original
Amateur Telescope Making book 1 for many variations.

Jarvis Krumbein
 
On Mon, 3 Sep 2007 21:39:31 -0700 "Jack.Swaton@starryhost.com"
<jack.swaton@starryhost.com> writes:
> 
> "If it's a Newtonian with the side bearings at the eyepiece wouldn't 
> you
> need a counter weight on a boom in Front of the eyepiece to balance 
> it? The
> longer the boom the less weight you need but the more space. Of 
> course if
> it's a permanent mounting weight isn't a big deal unless the 
> bearings are
> sensitive to it. 
> 
> Mitch"
> 
> Mitch,
> It is true that I have counter weights on the end opposite the 
> mirror. In
> fact, I have two sets to maintain proper balance at all altitude 
> levels: one
> set is on the "bottom" of the OTA and the other on the topside of 
> the OTA.
> My counter balances are actually crosses (as in "carrying my own 
> cross")
> with exercise weights on the ends. I tried one counter balance but 
> realized
> the physics meant that I would be out of balance if I moved the 
> scope more
> than 15 degrees.
> 
> Other notes: 
> --My bearings in altitude are 6" lazy susans
> --My bearings in azimuth are a combination of a 12" lazy susan 
> coupled with
> teflon and ebony star. I added the latter only because the lazy 
> susans added
> way too much flex. In the future I will just use teflon and ebony 
> star or
> try rollers.
> --The whole scope sets up in about 20-30 minutes
> --The current fork mount has too much flex and rebound 
> --Since I have almost zero time I am going to modify another Coulter 
> Oddysey
> Dob base and make it "tall" so I can use what's already made (a 
> teflon/ebony
> star base and 8" steel and teflon altitude bearings)
> --The OTA is a solid hexagonal wooden tube made of swedish birch 
> flooring
> someone threw away. It's really very pretty!
> --I have built in a 2 filter slide rig out of wood
> --I have attached a map stand that rotates with the scope so that in 
> order
> to read a map, I simply look down 12" and never leave my seat at 
> the
> eyepiece.
> 
> Feel free to email me off-post at: jack.swaton@starryhost.com
> 
> Best,
> Jack
> 
> 
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> 
> 
 
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