I went through this hassle when I got a nice 50 inch x 10 inch Al tube for an F7 eight inch mirror. To extend it ten inches, I got a sheet aluminum piece...
Scott im sorry i dont know what a slip roll is.. I will tell you what im looking to do... I have a f8 8 inch mirror i made this winter . I need the tube to be...
Lou, A slip roll is a specialized machine with 3 long and very stiff steel cylinders(rollers) that are driven by very strong interconnecting gears. With proper...
EL, I tried to find that ATM site and had no luck. Maybe im looking in the wrong place...Do you have a link to this site? Thanks. Lou ... From: EC Welch To:...
Here's a site where a guy used thin-walled sonotube as the base for a carbon-fiber tube for a 16": <http://www.robertb.darkhorizons.org/cbfson.html> You can...
Lou, www.atmsite.org is the link. I have used this link for years and it always worked. But this morning it times out and does not connect. I hope this is...
Lou, there is a place that sells aluminum tubing in small, cut sizes of several wall thicknesses. Damn, I can't remember their name now. They will even roll...
Hastings Irrigation is a good source: http://www.hipco-ne.com/ Although they won't have exactly 9.9-inch OD (although I'd think 10-inches would be "good...
Another thing. I suspect your "quality" is a question of thickness. For 10-inch tubing, Hastings lists thicknesses of .051, .064 and .094. Expense will go up...
... No! Consider two objects in thermal equilibrium (ie, at the same temperature) inside a perfectly insulating container. Each object emits some thermal ...
My 12.5 truss dob is being used increasingly for astro video observation. My dob is pretty well weighted/balanced, but with extended integration times or a...
... with steel wool)for the outside to radiate the heat as fast as possible. ... so bare aluminum is a very bad surface for cooling by radiation. ... Indeed! ...
That is easy if you have full circle altitude trunnions . The idea is to add an altitude pivot to adjust the friction so that you don't need an actual lock....
The opposite of this is a problem for SCT dew shields. Most commercial shields are black plastic or painted dark (Meade blue or Celestron black), so they cool...
The best dewshield would slow the heat loss from the corrector and not radiate the heat away. I made an SCT dewshield (and this lesson applies to tube...
... Hi Don, I think the ultimate in dew shield material is 1/2" thick Styrofoam sheets. It's used in the refrigeration industry. It comes with a foil paper...
John M wrote about radiative cooling: <snip> ... True indeed - but in order to avoid thermal problems, you want it to cool rapidly by convection/conduction -...
Hello, I am new to observation and have purchased a Zhumell 8 inch dobsonian telescope. I chose the Dobsonian because I had read that it was very child...
Mostly you need: - a way to find the objects in the sky - dark skies ... -- attilla danko, danko@..., http://cleardarksky.com/csk [Non-text portions of...
(I hit "send" too soon.) ... (nebulas, galaxies, etc..) this summer. Can I even do this? Yes. Mostly you'll need: 1. a way to find objects in the sky 2. dark...
A couple of other things to start - a straight through, reflex type of finder - no magnification, but would electronically superimpose a bull's eye pattern or...
... It's the simplest type of scope so it's not intimidating to use. But everything has a downside and in this case you have no computer or setting circles to...
Thanks so much for taking the time to give me some information. It is all very helpful. I will join a clubl right away. Glad to know that I don't really need...
Here's a link to the simple altitude brake I installed on my dob. It not only locks down when changing eyepieces, but can provide just a slight extra amount...
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