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Old 07-11-2016, 07:36 PM
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theodog (Jeff)
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Another Sirius Attempt -Wobblesock II

Hi All,
Bought this 3.5m from a fellow IISer over 12 months ago.
Finally making some progress.
Any tips?
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Old 09-11-2016, 09:46 AM
AndrewJ
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Round bit goes on top!!!

Andrew
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Old 09-11-2016, 10:03 AM
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theodog (Jeff)
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After much thinking and discussion I did this.
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Old 09-11-2016, 10:29 AM
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ZeroID (Brent)
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Won't hold much rain water that way, turn it over ...



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Old 09-11-2016, 11:41 AM
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theodog (Jeff)
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No time for that now.

Proof of the "Astro-purchase/Rain" Law.
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Old 09-11-2016, 04:20 PM
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Atmos (Colin)
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I figured it would have turned into a bath before the lid went on
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Old 28-11-2016, 12:53 PM
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theodog (Jeff)
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Instrument is in,
and first trial image taken.
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Old 28-11-2016, 08:17 PM
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strongmanmike (Michael)
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I am a little confused Jeff..?

In the earlier pictures there are three piers coming up out of the floor, but now there is only one EQ8 GEM which looks to have a single column..?

What are the straps for..just in case of high wind..? Do you use them after every session?

Is the floor directly concreted to the ground or just sitting on those concrete pavers..?

Mike
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Old 29-11-2016, 06:29 AM
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theodog (Jeff)
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Quote:
Originally Posted by strongmanmike View Post
In the earlier pictures there are three piers coming up out of the floor, but now there is only one EQ8 GEM which looks to have a single column..?
The three piers are formed on 3x 400x400x200 pads sitting on a solid "volcanized" sandstone rock layer. The 3 piers allow for the use of the EQ8 tripod unaltered. They are isolated from the Observatory floor by a small (1/2") gap.

Quote:
Originally Posted by strongmanmike View Post
What are the straps for..just in case of high wind..? Do you use them after every session?
The earlier image shows the dome in position but not bolted to the floor. Just in case there was some wind to move it. The dome is now firmly bolted down.

Quote:
Originally Posted by strongmanmike View Post
Is the floor directly concreted to the ground or just sitting on those concrete pavers..?
Image shows the sub-floor. It is to constructed using steel instead of timber (termites) with fibre cement flooring (imitation floorboards inside the dome). This produces an air gap under the observatory to allow for quicker cooling.
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Old 29-11-2016, 08:34 AM
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strongmanmike (Michael)
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Ah completely get it now, thanks for that, looks like an excellent build

Out of interest, why did you decide to build three piers to accommodate a tripod rather than going with the traditional single centre column only..?

Mike
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  #11  
Old 29-11-2016, 09:20 AM
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theodog (Jeff)
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Thanks Mike,

Thought about a single footing for the pier, but thought the cost of drilling into the rock, of concrete to fill the hole and pier manufacture could be high.
I had the technology to do it this way, so it was the cheapest option.
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Old 04-12-2016, 07:13 AM
gaseous (Patrick)
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that's some pretty solid looking steelwork!
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