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Old 03-08-2020, 07:24 PM
FrancoRodriguez (Franco)
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ROR Obsy: Chronicles of a total amateur

Hello everyone. I'm building a new roll off roof obsy. I am very lucky because one neighbour has a bobcat and the other is a builder who will be doing most of the hard work and technical designs.
I'm going to add to this thread as the process unfolds in the next couple of months. The bobcat and digger are coming on Wednesday.
The location is on the Darling Downs in QLD, about 1/2 hour south of Toowoomba. I live on 5 acres with no street lights. Bortle 3-4.
It will be a 3.5 x 4m roll off roof gable obsy, around 2m tall, with a 4x4m outdoor platform for viewing. It will have a 2 x 1.2m deep concrete footings, independent of the flooring to reduce vibrations. I will only be using one pier for now but I'm thinking about the future. I may want to have 2 telescopes going at the same time.
The main structural strength will come from a set of 2 very heavy rails which I got from Admerch. I got 4 solid brass track wheels, each one able to take 1500kg of force in every direction (most bearing systems are only designed for downwards gravitational force, but these ones can resist a lot of wind, in particular lift from updrafts).
I am totally new to this, and so is the builder (but he is extremely clever and and very well known in our region). I hope that anyone who is planning on going down the same path as I sees and learns from my mistakes and successes (I'm sure there will be plenty of both!)
I am so excited, a little scared, but I know this will be one of the best things I've ever decided to do.
Wish me luck!
See photos attached of the site. It will be in the old fenced area
https://imgur.com/a/ep9HaLv
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Old 03-08-2020, 08:35 PM
FrancoRodriguez (Franco)
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These are the wheels
https://admerch.com.au/product/gtr02...ate-wheel-set/

And the rails
https://admerch.com.au/product/canti...-heavy-series/
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Old 03-08-2020, 09:57 PM
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Joshua Bunn (Joshua)
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Good luck Franco. It sure is an exciting journey. I'm sure you will do great.
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Old 04-08-2020, 07:28 AM
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Sunfish (Ray)
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Good luck and happy building. Those wheels and track look to be incredibly heavy duty.
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Old 08-08-2020, 11:48 AM
FrancoRodriguez (Franco)
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plinth and footings are sunk

Well, after much work with a bobcat and auger the base of the pier along with 9 footings, all over 1m deep into the ground has been sunk. There will be plenty more concrete to come. The concrete that was used was 32MPa. The plinth for the pier will be 1200mm deep and 600mm diameter, reinforced with L shaped rebar. The tall poles, 100mm steel square beams will be cut to size.
I decided on just one pier. I could have gone for two but this would have caused issues with the minimum angles to the horizon, and possible clashing if I ever get a really long scope.

https://imgur.com/a/E8H9qwY
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Old 08-08-2020, 12:47 PM
FrancoRodriguez (Franco)
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upload

I'm trying to get the photos under 200k so they can be seen on IIS
Attached Thumbnails
Click for full-size image (Molecular cloud, the birthplace of stars and us all-15.jpg)
194.4 KB95 views
Click for full-size image (Molecular cloud, the birthplace of stars and us all-7.jpg)
173.3 KB97 views
Click for full-size image (Molecular cloud, the birthplace of stars and us all-2.jpg)
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Old 03-10-2020, 02:33 PM
FrancoRodriguez (Franco)
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So, the roll off roof observatory is finally coming together! It's got a 600mm diameter pier, 1.5m underground plinth with buttress rebar steel, completely isolated from the floor. The obsy will be 3.5 x 4m with roll off roof, and an outdoor balcony for visual astronomy. Can't wait till it's finished! If anyone wants the name of the builder he's a bloody legend. Cameron "Hambo" Hamblin in Ramsay just south of Toowoomba https://imgur.com/a/E9vrNo2
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Old 06-10-2020, 04:06 PM
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Anth10 (Anthony M)
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Lookin good Franco- very sure footings I see- itíll hold you in good stead.
Keep it up .

Anth
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Old 06-10-2020, 09:05 PM
FrancoRodriguez (Franco)
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Thanks Anth! Yes, it's way over-engineered. Far more than I had anticipated. Better over than under I suppose. The steel is really heavy and thick. I don't think it'll have much bend in it at all. And the concrete goes over 1m into the ground. I couldn't resist the urge to add a few glow in the dark rocks to the concrete mixture. They glow blue. They're very sparsely distributed. Probably a little tacky, but kids will like them and they won't interfere with AP or viewing.
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