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  #21  
Old 18-09-2018, 03:46 AM
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I've been chipping away at the observatory over the last months. It's been a big job so far, with over 3 tons of concrete used to secure the posts into the ground. That's all completed now, so the build is speeding up a bit now. The floor is fully sheeted and the walls are almost finished so I'm getting closer to installing the roof frame on top of the walls. A few more photos to follow.
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  #22  
Old 18-09-2018, 03:47 AM
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The isolated dob pad completed with the bearers and joists also finished, ready for the flooring.
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  #23  
Old 18-09-2018, 03:47 AM
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I sheeted the dob pad with 18mm compressed concrete. It's very strong, and heavy. I left a 20mm gap between the dob pad and floor joists, to avoid any vibration transfer to the dob. I sealed the gap with 20mm open cell foam to keep the dust and critters out.
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  #24  
Old 18-09-2018, 03:48 AM
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The floor sheeting going down showing the recess for the dob. The dob pad is 50mm below the level of the floor. Every little bit helps when trying to drop the eyepiece height.
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  #25  
Old 18-09-2018, 03:49 AM
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The completed roof frame. It will roll on the sidewalls using roller bearings located inside c-channel. More photos about that when I get to it.
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  #26  
Old 18-09-2018, 05:33 AM
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Hi Allan, nice to see the progress photos. How are you actually going to get that heavy Black Widow into the hole? Is it going to be disassembled and reassembled inside the opening from above? Obviously it does not need the base roller wheels anymore. Just trying to get my head around how it will work. Fascinating.
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  #27  
Old 18-09-2018, 10:02 AM
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Looks great, following.... The standard of workmanship looks excellent.
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  #28  
Old 18-09-2018, 02:54 PM
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Quote:
Originally Posted by glend View Post
Hi Allan, nice to see the progress photos. How are you actually going to get that heavy Black Widow into the hole? Is it going to be disassembled and reassembled inside the opening from above? Obviously it does not need the base roller wheels anymore. Just trying to get my head around how it will work. Fascinating.
Hi Glen. This is a shot from the front. The door will locate between the two posts at the front. I'm going to pull the dob apart and give it a big clean up, and then roll just the base up some ramps I have. The door is designed so the dob will just slide through the opening on its wheels. Once it's inside and on the pad I can put it back together.
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  #29  
Old 18-09-2018, 02:54 PM
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Looks great, following.... The standard of workmanship looks excellent.
Thanks, I see you have a ROR obs too.
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  #30  
Old 18-09-2018, 02:58 PM
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Thanks, I see you have a ROR obs too.

Yep - I could squeeze a few of mine inside yours....
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  #31  
Old 01-01-2019, 01:39 PM
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Its been a while, but I managed some more building of the dobservatory. Sadly I haven't managed to avoid the build running into the heat of summer which I was really hoping for. Only had one curious brown snake come check it out so far. I turned him into two 3 foot long snakes.
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  #32  
Old 01-01-2019, 01:41 PM
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This shows how the roof attaches and rolls on the walls. I bolted C channel to the top of the walls. Roller bearings then roll inside the C channel and make the roof captive to the structure. I fitted a couple of 1" pins through all the channel and wall top plate and that prevents the roof from rolling.
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  #33  
Old 01-01-2019, 01:43 PM
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The sheeting is starting to come along now.
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  #34  
Old 01-01-2019, 02:09 PM
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Looks amazing Allan, a fitting shrine for your scope. I wanted to give up astronomy-related jealousy for the new year, but you've ruined my resolution already!
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  #35  
Old 01-01-2019, 02:20 PM
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Quote:
Originally Posted by Allan View Post
This shows how the roof attaches and rolls on the walls. I bolted C channel to the top of the walls. Roller bearings then roll inside the C channel and make the roof captive to the structure. I fitted a couple of 1" pins through all the channel and wall top plate and that prevents the roof from rolling.
Looks great Allan! Is that your welding, or a local from Coolah? That pin looks like it could hold the wings on an A380 - substantial.
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  #36  
Old 01-01-2019, 03:05 PM
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Looks amazing Allan, a fitting shrine for your scope. I wanted to give up astronomy-related jealousy for the new year, but you've ruined my resolution already!
Sorry for ruining your resolution
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  #37  
Old 01-01-2019, 03:10 PM
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Looks great Allan! Is that your welding, or a local from Coolah? That pin looks like it could hold the wings on an A380 - substantial.
Thereís a good metal shop in Coolah, so the welding is their work. I was in there a few days ago talking to them about the door for the obs. Welding inside a 40 degree shed didnít look like much fun.
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  #38  
Old 01-01-2019, 07:51 PM
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Looks like it's coming together nicely Allan.
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  #39  
Old 01-01-2019, 09:59 PM
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Thanks Jeff, yes Iím getting there. Iíll have you guys over when itís finished.
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  #40  
Old 02-01-2019, 10:35 AM
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Looks fantastic Allan.
A Well planned and executed project.
Cheers.
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