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Old 20-08-2011, 09:29 PM
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graham.hobart (Graham stevens)
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Location: hobart, tasmania
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newbie extreme pier question

Greetings all. At the moment I have an EQ 6 pro and a CGEM which I use on a wooden deck out back. Vibrations are not too bad so long as I don't move during exposures-at all.
I have damped them down with home made anti vibration gear (I find half a thong on a gym mat works as well as anything) but would like a more permanent, stable setting-also one that takes up less room in the end.
What I want to achieve is a single pier that I can put my EQ 6 and my CGEM on for different scopes. Also the footprint of the pier would be less than a tripod or two so my wife and child can have some of the deck back!
My problem is that my deck is a sort of cantilevered floating deck over rough tapering downhill ground. I have measured the distance just to the surface from roughly where my scope is now and it is at least 1200cm.
I reckon I can get permission to cut a hole in the deck to put a pier and isolate it from the deck, but it would be quite long to reach the ground and be buried well, and then reach up to my ideal tripod height.
Is this possible and likely to succeed?
What sort of pipe would I use?
What would I fill it with?
What depth should it be buried to?
Is it feasible to expect to be able to use both mounts on it or should just try and use one?
I would really like to be able to just take my scopes and electronics outside each time so am curious as to the feasibility of this.
The other issue is that digging a deep hole underneath the deck would be a nightmare- no room to stand up or swing a shovel as the clearance is less than human sized.
I know, lots of questions.
Regards
Graham
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Old 20-08-2011, 11:02 PM
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koputai (Jason)
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Graham,

What sort of ground is it underneath your deck, I take it that it's dirt/rubble? You would need quite a long post and a deep hole, seeing as the top of the pier will be at least two metres above ground level (I think you mean 1200mm).

I'm currently building a pier through the back deck. Mine is in to sandstone and not far below the deck, so my total pier height from the bottom of the hole to the top plate is around two metres.

The digging of the hole is shown in this thread:
http://www.iceinspace.com.au/forum/s...ad.php?t=58252

The metalwork has now also been completed, so I'm just waiting to glue it in, which will happen as soon as the epoxy arrives!

Cheers,
Jason.
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Old 21-08-2011, 09:11 AM
mikerr (Michael)
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Location: NSW Australia
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Graham, maybe consider digging a broad shallow hole and making a concrete pad that you would then Dynabolt the flange on the bottom of the Pier to. You will have a flange welded to the bottom of the pier right?? .

Please don't post any pics of yourself wearing a Thong on the Gym mat. That could cause a severe distraction to other members.

Michael.
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Old 21-08-2011, 02:47 PM
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OzRob (Rob)
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Location: Thailand
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To get an idea of the size of tubing that you would need have a look at this: Pier Designs Fundermentals
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