My astronomy project:
Making of an Observatory part 2
1: Building the door
New weekend and today it's time to build a door to the observatory.
Here is the first part of the frame for the door with its hinges mounted.
Now the frame is finished and it's time to mount the panel.
When we did a renovation of another house we got some used white panels left over. Just cut the bad part away from the end, a new paint will later make them as new.Back to contents
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2: Building the hatch
Last time I was so in hurry to cover the building that I didn't had time to take photos.
Here how it looks when I left it last time. Today I going to build the hatch.
First I need some locking mechanism to the roof and hatch, later I maybe ad a motor to open hatch and roof. This eccentric lock is adjustable, it looks maybe a little bit weak, but this is just for the small south part of the roof.
The hatch much have a hinge, you can see it here, just left to the red panel.
I need to lower the hinge and the stud it's attached to. Also cut openings in the panel for the hinges.
Here is the stud that has to be lowered.
First hinge attached.
Just two hinges will not be enough, I will ad a third one in the middle, and that one will be mirrored to lock the hatch to not move in sideways.
First opening of the hatch!
Now I have attached the hatch to the south part of the roof. I also added another red panel.
Now it's time to separate the roof in two parts. Will the roof hold together or fall apart?
The cut operation was a success!
Here I have planted tiny small green plants. The idea is that those small plants will grow to two meters height to the next summer. The purpose is to have a wind protection and also make the observatory invisible. I have also cleaned the rock from all other green stuff.
To the roof I use a bigger version of the eccentric lock.
The backside lock.
Here where the letter "A" is I will place a counter balance weight and a chain to lock the hatch in open position.
Added white corners to get it look like an old Swedish house.
This was the last work on the observatory 2016.
I have not found a roof yet to the observatory and now the winter are coming.Back to contents
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3: Mounting the roof panels
Now at late spring it's time to start to building on my observatory again. I have bought one channel plastic panel in dimension 6x1.2 meters 33 mm thick, cut it down to two 2.2x1.2m.
First panel mounted. If I get problem with my two part roof I can connect them again as an one roof construction. The roof panel are still long enough to cover both roofs.
Screw that hold the roof in place.
Under the screw there is a gasket to make it water proof, I don't want any water on my equipment!
Both roof panels in place. I will cut the end later if this two roofs construction will be good.
On the sides I shall also have this kind of panel, but not that thick, maybe 12 to 16mm.
The profile of the roof panel is X-form. It shields against heat and cold and I hope the dew buildup on inside will not be a problem.
What's left over of the panel I use to the small part of the roof.
First side panel mounted.
Second side panel mounted. How many screws do I need to let it withstand the wind?
Waiting for a special solution to keep it tight against weather.
I think it will be a solution with a steel or aluminum panel over the roof top.
Seen from inside.
I think it will be wise to reinforce the roof against the weight of snow in winter. The panel has low friction and it should not build up any big piles of snow atop, but who knows.
Later I must reconstruct the hinges, it must open at a more wide angle and also be stronger.Back to contents
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4: Roof top panels
Today I shall try to make a top cover of the joint of the two roofs. Not an easy project.
I need some profiles with length of 2.5 meters, these was the only ones I could find, they are made of steel. I need two of them.
First I made this distance of wood to have something to mount the top panels at.
The distance in place.
The profile that cover the lower big roof at right. You can see how the right side of profile ride on top of the plastic roof panel.
From other side and now the second top roof panel in place. To the right is the panel that cover the lower roof panel.
A view over the small roof panel with the top cover, it looks nice.
The left roof swing over the right roof panel when closing. I already now see that I will get problem here. The right roof panel isn't very step. If the wind blow from wrong direction it will press the water up under the top cover and then drop over the edge into the observatory.
In closed position.
View over the big roof panel. I feel this will not be easy to get to function properly. It had been easier If I had chosen an ordinary sliding roof. But then it hadn't been as exiting as this solution, and if I don't want to have any problems I shouldn't doing astronomy at all! I can always change the construction easy to a sliding roof. The drawback with a sliding one part roof is that I need an opening to the telescope.
Here is the three alternatives I working with:
With roof divided in two parts that one part swing and the other part slide none of them will hit the telescope. For this I need rails outside the observatory. I must slide the roof very far to the right to not hide my free view out.
With both roof swing on hinges it will be an easy construction. Could be difficult to open and close in heavy winds and other drawbacks.
With the right roof lifted by four arms was my plans from beginning, or maybe two arms in one end and a wheel at the other. With this construction I can had the roof top in the same height as observatory walls when open. This will be the most difficult construction and have it stable enough.
It will work something like this:
(Ford Skyliner hard top, Youtube)
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5: Building a stable base to the legs
To have my observatory in correct position I must have it standing on a stable platform. Today I will make that base.
Here you can see the stairs up to the observatory, not so easy to access and carrying heavy equipment in the cold and dark winter.
First I have to center the observatory building around the pier and have one wall in south direction. From the center of the pier to the closest wall I have 0.95 meters, it's a small observatory but no need to stand inside it.
In our garden I found this big concrete tiles that I can use.
First I make a stone bed that the concrete tile can rest on, very carefully get it in level.
And then place the concrete tile on top of the stone bed. Checking that it's still in level.
In one corner there is no rock underneath, just a lot of stones.
After moving around the stones I got it stable and in level. Then I also have to have the observatory in level. Small wooden wedges make it. Later I have to match the high of the observatory building to the mount and telescope I will have installed into it.
Here how it look with all the four corners are in level and correct position.
These small stones will move away if I don't fix them in position. I will pour concrete over them.
First I have high viscous concrete around the rim, later I lift the concrete plate and pour low viscous concrete under it that flow out between the stones.Back to contents