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RugbyRene
12-05-2022, 09:11 AM
Hi all,

I'm looking to build myself an observatory but this one is a bit different. I'm space challenged where I live but have found a spot where I'll be putting a pier. I'd like to build an enclosure that covers either the pier and mount/scope, or just the mount/scope (leaving the pier exposed).

I can't build a shed or any similarly sized structure due my aforementioned space constraints.

So I was wondering if other people here are in a similar situation and what they have done.

My mount is a SW AZEQ6
Scope is a SW Esprit 100ED

I'm happy to remove the scope and just have a cover for the mount and pier.

Cheers

Rene

JA
12-05-2022, 09:49 AM
Hi R,

Given your space constraints you could consider a large inverted plastic bin, with the mount and part of the pier sealed inside the bin, wrapped in a towel or two. I would choose an opaque white bin and/or use reflective foil on the outside to help reduce heat somewhat and maybe even use some insulation on the inside surface of the bin. Keep the bin as small as possible to limit the amount of entrapped air and hence water vapour. If you wanted to go crazy you could even do something to limit heat conduction via the pier to the mount and/or use a double walled bin construction in conjunction with the previously mentioned reflective foil.

Also ensure the pier is on/over a concrete slab, rather than over grass so as to limit localised moisture / humidity.

The goal should be to achieve as stable an environment as possible inside the enclosure, free from water and extremes of high and low temperature and moisture so as maintain the service life of electronics, rolling/sliding surfaces, lubricants and minimize corrosion.

Best
JA

mura_gadi
12-05-2022, 01:51 PM
Hi,

I setup between two garden beds, inset four PVC pipe in the edge of the garden beds(or into the ground with caps) and used a set of broom handles as poles. Cheap 2nd hand sheets stapled to the poles, and you can erect some walls quickly. Its fast, light way to setup a block for the neighbourhood lighting. Not too heavy fabric as they need to dry upright in the garage after a dew etc.

Not really a pull down obs', but does help a lot with my suburb viewing. (single storey homes and street lights)

Tinderboxsky
12-05-2022, 02:09 PM
Hi Rene,

I built just the solution you are looking for. See my thread:

https://www.iceinspace.com.au/forum/showthread.php?t=176146

Hopefully this may give you some ideas. Let me know if you would like any additional information.

mswhin63
12-05-2022, 10:01 PM
I built my second iteration of a fully enclosed system. I was a lot more challenged in that the only location was on the grass of my rental home.

The final version I expect will be made of fibreglass.

It is lockable as well as waterproof as is. Fibreglass will be long-living.
It has been set up internally for positive air pressure with an air gap between the outer layer and inner layer. I have an input air circulation port underneath but am in no hurry to develop a cooling system as winter is coming.

I was planning to use my wife's business to sell these, but I haven't done any final determination as yet.

OzEclipse
14-05-2022, 09:06 AM
Many years ago I built such a structure to hold mount without OTA. I was offered the opportunity to bolt down a pier at Arthur Page's then Mt Tamborine observatory. I built a lightweight box frame out of 50x50mm Oregon pine about 700x700x1600mm(h). I then ordered 4 pieces of 22 gauge galvanised iron from a sheet metal shop. each piece was the size of the side of the structure but each had 90 deg fold on the edge with a 50mm strip on the fold. These returns were all overlapped to prevent ingress of water at the corners and added a lot of strength and stiffness to the structure. One side was removable and the frame at the base on that side was on a hinge with a shed bolt catch.

The sheet metal shop made me a square cap for the structure with soldered seams and 50mm vertical sides. It was a little oversize allowing the removable side sheet to be inserted and removed from under the cap. I made the whole thing as an 18 yo with minimal construction skills. Mt Tamborine was a high rainfall zone, the structure kept the scope dry. Two loxons were drilled into the slab and two 1/2" bolts held the whole structure down in the face of sometimes very high winds. There were two substantial handles on the sides which made it easier to drag off and away from the mount. Two if the cross braces were at "observing seat height." I had a shelf I could insert in there and sit inside it, shielded from the wind during hours of manual guiding that was an unavoidable part of AP in the early 1980's. In the 2nd photo you can see it with shelves inserted.

Were I to build it today, I'd use much lighter weight aluminium siding or fence panels, readily available and cheap.

Joe Cali

OzEclipse
14-05-2022, 10:14 AM
Hi Malcolm,
Looks like an excellent design. It also looks like a very sheltered location.

The only problem I see is that the cover is attached to the mount. If it gets bumped, the mount moves and you lose polar alignment. Further, there is no way to protect or stabilise it from high winds which could blow the whole thing over.

In your final commercialised version, you should consider including anchor points so that the cover can be held down to the ground with guy ropes or steel cables. Putting tension on these cables could also affect polar alignment but better that than a blow-over.

This is a video of a blow over with only a soft cover over the scope.
https://www.youtube.com/watch?v=vflgrWPQZ68&ab_channel=DanBartlett

Joe Cali

mswhin63
14-05-2022, 02:06 PM
Hi Joe,

This has already been considered and is an easy addition. I do live in a fairly sheltered position and already in this configuration, it has survived without flinching at 90kph winds, but obviously, the level of the wind in my location would have dropped at the scope.

I decided not to put them in at this point, I want to leave that and get some measurements done first and consider the location of mounting options.

A job in my past before doing what I do now was antenna mast installation up to 60 metres in height. I learnt how hard they can fall when the supports fail.

My design methodology at this time is iterative (Elon Musk's method "Crash and Burn") and when I get all my prototype projects complete, I hope to concentrate on full System Engineering Design work.

AstroApprentice
15-05-2022, 08:59 AM
A couple of years ago I talked to Owen of Sirius Domes about a mini dome. At the time, he was thinking about making the Miniature Astrodome that was designed (see pic), and from memory, never manufactured. He said the structure would be much cheaper than a full size dome, but feared the required motors/controllers etc needed for automation would be as much as for a full dome, likely deterring buyers. So he shelved the idea. You could talk to him about the simpler, non-automated fibreglass box design…

mswhin63
15-05-2022, 11:39 AM
Nice design, I would do something like this, but mine is designed as I live in a rental property and am limited on what I can build on. The grass is still growing which is the primary reason for my design.

Next time, either buy a home and land or rent a place that has paving.

Boozlefoot
15-05-2022, 02:56 PM
I've been through the "obs mill", and after years of deliberation have opted for a "pier garden", with a dehumidified and wood heated warm room within elect cable distance of my 3 piers, and a concrete ramp to wheel out the big fellas. I find proprietary obs somewhat cold and cramped anyway. Having said that, obs are very much a personal preference thing. As for the mini dome, my idea when considering same was for a simple hatch/box on a rotating turret. Doesn't have to be round, and you can "hinge" same with a prop system at varying openings if you don't want to open the aperture fully. Keep it small enough to fit on a box trailer in parts if you are in the situation of possible future moves. Think outside the box! Employ the KISS principle. Think of the 2.4m cut sizes for timber - much cheaper/available. The tilting hatch is good as it doesn't have seams near the zenith, avoiding drips on your gear.

AstroApprentice
15-05-2022, 08:02 PM
When I was thinking about a mini-obs, I also considered cutting down a tripod or using a very short pier to simplify the obs structure. Avalon have since built a mini tripod, which would be ideal for a mini-obs, unless tripod height is needed due to viewing obstacles.

RugbyRene
20-05-2022, 01:23 PM
Do you have photos?