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#1 Cdnpilot

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Posted 16 October 2013 - 03:35 PM

After multiple procrastination delays, I am in process of putting up an 8' ExploraDome in my back yard. I have an LX-200 8" scope currently. Looking for advice on the pier which will be cement. I was going to go with a 10" diameter but currently wondering if that should be 12". Anyone have any thoughts?

Thanks!
Kevin

#2 Footbag

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Posted 16 October 2013 - 03:53 PM

I think 10" would be sufficient, it would be more a matter of future-proofing. Do you see yourself going bigger?

Also, will there be electrical/conduit running through the pier? If there will be, then 12" will give you more room.

#3 Aquarist

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Posted 16 October 2013 - 08:19 PM

I have a 10" ATS pier (on concrete) which is good for a couple of hundred pounds easily.

#4 Midnight Dan

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Posted 16 October 2013 - 09:16 PM

I have a 12" pier under my C8. I was torn about what size to use and was considering an 8" or 10" pier, but I'm glad I went with the 12". It by no means seems "too large".

It's not really about how much weight it will carry, but more about how rigid it will be.

-Dan

#5 Aquarist

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Posted 17 October 2013 - 05:14 AM

Yes, Dan, I know. When we were building this whole thing we had Astro-Physics consult with us about what and what size to use. The 48 inch into the ground concrete part is 24 inches with multiple rebar, however.

#6 stmguy

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Posted 17 October 2013 - 09:48 AM

I'd say 12" minimum, that is what I went with for my 10" scope and the bolts for the pipe flange come a lot closer to the edge than what I would like for the pipe flange for the 6" well casing
Norm

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#7 dawziecat

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Posted 17 October 2013 - 12:21 PM

I don't even have a pier yet. :D
But, I'm working on it!

A question you have to ask is how do you plan on attaching the base of the mount?

I wanted to use one of these.

They only come in 8" and 12". Eight seemed inadequate to my goals (imaging with an AP-1100 and a sixty pound refractor) so I decided on a 12" pier. I have the plate. It's gorgeous! (Thanks for great workmanship, Dan!)
Now I have to get the tree removal guys outt'a here so I can get a pier dug and poured!

Winter's comin'! :coldday:

#8 Aquarist

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Posted 17 October 2013 - 03:21 PM

Well, it is about to get cold boys and girls, so if your building in the next few months, dress warm!

#9 Megabusa

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Posted 17 October 2013 - 04:29 PM

After multiple procrastination delays, I am in process of putting up an 8' ExploraDome in my back yard. I have an LX-200 8" scope currently. Looking for advice on the pier which will be cement. I was going to go with a 10" diameter but currently wondering if that should be 12". Anyone have any thoughts?

Thanks!
Kevin

Kevin , When I built mine I read and I looked and I asked and I read and looked and I asked , O, did I say read , Yes I came up with 10" Pier , I have all that's on the bottom of the Post and a 20" EX-Pier bolted to it , With all that I sometimes use it to hold My self Up to reach outside the Dome , and I weigh about 195 Lbs , Make sure you put Re-bar and Anchor Bolts for a LX-200 Mounting Plate , Dan's Pier Plates www.pierplates.com could give Info on that . :) Nate

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#10 Megabusa

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Posted 17 October 2013 - 04:33 PM

One more with the Pier-EX

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#11 Cdnpilot

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Posted 17 October 2013 - 10:14 PM

Well, it is about to get cold boys and girls, so if your building in the next few months, dress warm!


Cold? Nah, not here.... lol... yeah that is why the pressure is on to get this done by early November...

Nate - thanks for the info. Someone once told me I get to ask 1 dumb-*BLEEP* question of the day.... what is an Ex-Pier (btw, I think I have used my quota up until 2020...)

Kevin

#12 tim57064

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Posted 27 October 2013 - 07:42 AM

Kevin, Have you decided on your pier size? If so,what have you decided on?
Any images of the area you are placing your dome?
How about the dome itself? Pic's ,pic's and more Pic's please.

#13 Cdnpilot

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Posted 29 October 2013 - 07:16 AM

Yes, going with 10" that will be 4' off the floor. I put my scope on the tripod/wedge and measured to ensure it would work. Hopefully today I will pour the cement. The dome is sitting in my garage, with the car in the driveway. My wife has already enquired whether this will remain for the winter... Sigh.... As for pics, will try to get some.

#14 LouHalikman

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Posted 29 October 2013 - 10:11 AM

i have a 14" concrete pier sitting on a 5000# block of concrete undergound. It holds a CGEPRO and a C 14HD with no trouble.

Consider instead a concrete platform with a metal pier to bolt on top. You might decide in the future to get a large dob, and the concrete pier will prevent you from putting it in the observatory. Just a thought. Lou

#15 Cdnpilot

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Posted 29 October 2013 - 08:01 PM

Well, I put it up today and it was a 10"... if I could figure out how to post a photo i would show it...

#16 tim57064

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Posted 29 October 2013 - 08:19 PM

Kevin,great news.Your on the way.
Download bd sizer and re-size your image with it.
When you go to post a reply,at the bottom of where you are posting you will see a box to check mark saying "I want to preview my post and/or attach a file". Check that and hit continue. you will see where you can attach a file.
click on choose a file and add your image from your folders where you store your images on your computer.
Others may chime in here on the subject.
They may be also able to help.
Also if you are replying on a previous post you can just hit "Preview reply" and go to where it states to do what I said above,attach file and post. Hope this helps.

#17 Cdnpilot

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Posted 30 October 2013 - 07:46 AM

Ok - thanks! It seems every forum is a little different... well, here it is so far - this is looking north.

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#18 tim57064

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Posted 30 October 2013 - 08:01 AM

Looking good Kevin as it appears you already have you deck supports up too. :waytogo:
You say your ExploraDome is 8'? How wide are you making the deck?

#19 Cdnpilot

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Posted 30 October 2013 - 04:44 PM

I am building an 8 foot octagon shaped deck so it should be pretty much the same footprint as the dome. Well, that is the plan....

#20 John Fitzgerald

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Posted 30 October 2013 - 05:45 PM

Don't let the floor stick out beyond the bottom ring. You WILL get water inside if you do.

#21 Cdnpilot

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Posted 31 October 2013 - 08:51 AM

Thanks john, I had planned on putting the deck boards down, then using the wall base support as a template and cut the boards off so they will even with the base. Then I need to decide on what to put on the floor inside - maybe those rubber interlocking mats.

But, anyone have thoughts on how to seal the gap between the floor and the cement pier? We have a lot of field mice here.

#22 csa/montana

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Posted 31 October 2013 - 10:34 AM

maybe those rubber interlocking mats



There has been several discussing static shock using some of this type of flooring.

For sealing around the pier, perhaps use some metal screendoor material, along with silicone, where it comes up against the pier. :question:

#23 JJK

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Posted 31 October 2013 - 11:09 AM

Thanks john, I had planned on putting the deck boards down, then using the wall base support as a template and cut the boards off so they will even with the base. Then I need to decide on what to put on the floor inside - maybe those rubber interlocking mats.

But, anyone have thoughts on how to seal the gap between the floor and the cement pier? We have a lot of field mice here.


You might use a narrow gauge, tough wire mesh to keep out the mice.

#24 Cdnpilot

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Posted 31 October 2013 - 12:13 PM

Screen and silicon great ideas thanks!

#25 Aquarist

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Posted 31 October 2013 - 05:37 PM

Don't let the floor stick out beyond the bottom ring. You WILL get water inside if you do.


Correct.






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