cnchillstar
super member
Reged: 12/29/08
Posts: 102
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Hi, I found ash dome use rib to clip sheets and tighten with screws on top&donw side. is there any welding works for ash dome? it looks not stable if only link with the small rib gap...
and is every sheet between each two ribs separately? or one big sheet beyond some ribs?
thanks very much!
http://www.stargate4173.com/Phase5/equipment/JAlbum/AssemblyInstructions/slides/page06.htm
Edited by cnchillstar (11/01/09 08:35 PM)
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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I have an older one. 1968 model that I refurbed. I don't know if or how much they changed the design over the years. Don't see why they would.
Each panel is seperate. They are about 2' at the bottom (2 ribs) and whatever they need to be at the top to meet the shutter opening frame. The only place there are screws or bolts holding the panels is around the bottom where they meet the ring.
where the joints are in the panels there are designated spots where you insert a U shaped clip. This stiffens the whole thing up very nicely, coupled with the screws and bolts in the ring.
There are maybe a dozen bolts securing the shutter frame and then maybe a dozen more for the shutter tracks.
There's no welding for you to do. It's very straight forward engineering. I see no reason mine won't be around another 40 years.
I'm not a vendor for Ash. I just own one.
Ash dome thread
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Edited by Scott Horstman (11/01/09 04:18 PM)
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AlienFirstClass
professor emeritus
Reged: 02/13/09
Posts: 744
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Quote:
I have an older one. 1968 model that I refurbed. I don't know if or how much they changed the design over the years. Don't see why they would.
Each panel is seperate. They are about 2' at the bottom and whatever they need to be at the top to meet the shutter opening frame. The only place there are screws or bolts holding the panels is around the bottom where they meet the ring.
where the joints are in the panels there are designated spots where you insert a U shaped clip. This stiffens the whole thing up very nicely, coupled with the screws and bolts in the ring.
There are maybe a dozen bolts securing the shutter frame and then maybe a dozen more for the shutter tracks.
There's no welding for you to do. It's very straight forward engineering. I see no reason mine won't be around another 40 years.
I'm not a vendor for Ash. I just own one.
Ash dome thread
EVER have ANY leaks?
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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Quote:
EVER have ANY leaks?
Not through the dome. I need to reseal the bottom of the walls though. I get a ltttle poodle if we get a lot of rain.
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cnchillstar
super member
Reged: 12/29/08
Posts: 102
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what is the roller matieral? It must be very durable for turning decades under a heavy weight.
Edited by cnchillstar (11/01/09 09:47 PM)
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cnchillstar
super member
Reged: 12/29/08
Posts: 102
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thanks!Scott! your dome looks very nice! it is just what I want.
if the sheets are only clips by the ribs to endure high speed wind,the design is so smart. I am afraid they will be torn off like banana 
and ash dome only has verical roller without horizonal ones to constrain like fiberglass domes.
is each sheet have a 3D ball shape or just 2D curve like cylinder side surface???? the latter will be easy to make.
I am looking your post and please help further, Scott!
thanks!
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Fraxture
member
Reged: 07/09/09
Posts: 56
Loc: Central Ohio
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That is a beautiful setup!
And you are only 70 miles from my location. 
Do you attend the CAS @ Perkins? I am going to start going there with a co-worker who has also been bitten by the Astronomy bug. 
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John B.
You make a living by what you get, you make a life by what you give.
Orion XX12i
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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Quote:
thanks!Scott! your dome looks very nice! it is just what I want.
if the sheets are only clips by the ribs to endure high speed wind,the design is so smart. I am afraid they will be torn off like banana
and ash dome only has verical roller without horizonal ones to constrain like fiberglass domes.
is each sheet have a 3D ball shape or just 2D curve like cylinder side surface???? the latter will be easy to make.
I am looking your post and please help further, Scott!
thanks!
The rollers are like heavy duty garage door wheels that are bolted to the top of the wall. The track is curved to match the radius of the ring so the wheels are in the channel and cand't lift off. The wheels are about 2' apart.
I'd say a 2d pattern would be the template. The curve of the sphere is so gradual that I'm not sure if it's a consideration.
As far as it ripping apart like a banana, if the wind is that strong I'll be flying away in the whole observatory like Dorothy in The Wizard of Oz.
If you're considering modifying a silo dome this web page might help.
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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Quote:
That is a beautiful setup!
And you are only 70 miles from my location.
Do you attend the CAS @ Perkins? I am going to start going there with a co-worker who has also been bitten by the Astronomy bug.
Haven't been to that but we do have a CN party here each June. The more the merrier.
Ohio Never Ending Star Party.
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astrotrf
professor emeritus
Reged: 09/30/07
Posts: 709
Loc: Rodeo, NM
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Quote:
I get a ltttle poodle if we get a lot of rain.
Next time you get one, please lemme know. I have a friend who's looking for a new dog.
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Terry (astrotrf)
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csa/montana
Den Mother
Reged: 05/14/05
Posts: 40316
Loc: montana
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Carol
AstroTech 16" Dob (Thanks ASTRONOMICS!)
Vixen 80MF/AstroTech Voyager
Masuyama's 7.5, 15, 25W, 35mm,
Pentaxes; 5XW, 7XL, 10XW.
14mm Meade 4000 UWA
TV Panoptics; 22, 35
DreamCatcher Dobservatory, #2
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Scott Horstman
Vendor- Backyard Observatories
Reged: 03/11/04
Posts: 8074
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Quote:
Quote:
I get a ltttle poodle if we get a lot of rain.
Next time you get one, please lemme know. I have a friend who's looking for a new dog.
You know......When it rains cats and dogs you could step in a poodle. 
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cnchillstar
super member
Reged: 12/29/08
Posts: 102
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Hi, what are those sheets and ribs material? I got two information: someone say they are made from aluminium 3003, but some files say it is Galvalume,which should be steel base and coated with Aluminium and Zinc.
does somebody know about this?
thanks!
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