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Backyard wood Pier

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84 replies to this topic

#76 CharlesW

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Posted 28 January 2013 - 11:03 AM

If I could make one more gentle suggestion, especially since you're using plywood top plates right now? Your bolts should be as short as possible and still provide the leveling feature that you want. At the length they are now, they are acting like four levers trying to twist and cut their way through your plywood. I know this is opening a heated debate with a lot of people but, it makes no mechanical sense to have longer bolts than you need.

#77 dandabson

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Posted 28 January 2013 - 02:21 PM

I intentionally left them that, lenth to facilitate removing the mount. I did not want to have to remove.the upper plate if I take the mount to a starparty or dark site.

#78 TigerDeath

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Posted 02 February 2015 - 01:52 PM

:-( Pics are gone.

 



#79 th3r3ds0x

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Posted 02 February 2015 - 02:56 PM

I built a pier like this this year using 4 6x6x8 posts and two 1/4" thick steel plates as a leveling mechanism. I have a CGEM pier adapter on it. The posts are sunk 3' deep using 3 80lb sacks of cement. It is extremely solid. I built a small deck around it as well. Just a basic observation platform out in back yard where there is the best view of the sky. I'd be glad to post some pics of interested.
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#80 John Miele

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Posted 03 February 2015 - 09:40 PM

I built a pier like this this year using 4 6x6x8 posts and two 1/4" thick steel plates as a leveling mechanism. I have a CGEM pier adapter on it. The posts are sunk 3' deep using 3 80lb sacks of cement. It is extremely solid. I built a small deck around it as well. Just a basic observation platform out in back yard where there is the best view of the sky. I'd be glad to post some pics of interested.

Hi,

 

I'd like to see your pics. I built one also and it's still working well...John



#81 th3r3ds0x

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Posted 03 February 2015 - 10:39 PM

Here it is.  I'm going to take the plates off this summer to clean, prime, and paint them.  The rust doesn't cause any issues other than being hideous.  The pier works very good and only took a day to get together.  I got the idea from a post on one of the astronomy forums, might have been on here.  It just seemed so easy and I didn't have to worry about molding cement.

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#82 TigerDeath

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Posted 04 February 2015 - 02:22 PM

Very interesting design, th3r3ds0x!

 

I was wondering how wood would hold up to vibrations! Looks like you're doing imaging on an astrograph as well, do you have any problems with vibrations or movement when walking around the deck? What about jumping up and down on the deck, does that affect it at all?

 

I've moved the rest of this post to a new thread, save this thread for the OP.

 

 

Link to new thread/post: http://www.cloudynig...land/?p=6431610

 

Thanks!
-Duane


Edited by TigerDeath, 04 February 2015 - 03:17 PM.


#83 th3r3ds0x

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Posted 04 February 2015 - 05:02 PM

The deck is 100% separate from the pier.  No vibrations pass to the scope.  I've actually tested this by having my son jump up and down on the deck while I monitored the live view image on my PC and I saw nothing.  I've also detected no vibrations from walking around the deck while I'm imaging.  The pier is incredibly strong and very solid.  It is also extremely heavy.  Once I got it in the hole I leveled best I could and let the cement set.  The steel plates are extremely rigid.  I'm not sure how much weight they would handle before there would be any flex but I can say my gear doesn't even begin to make them flinch.  The design makes it very easy to get it perfectly level.  I built it over the summer and I have not had to make any adjustments to it yet.  I used pressure treated posts.  I expected a little bit of settling but it's looking like it will probably hold up for a good many years.



#84 Henry from NZ

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Posted 01 September 2015 - 04:43 AM

I read thru this thread with much interest.

 

Now that it's been a while since the pier is installed, how is the pier holding up? Is it still keeping its alignment?

 

I am tossing between this versus a metal pier on a concrete pad, though for obvious reason the latter is much more expensive.

 

and what glue do you use to bind the posts together?

 

Many thanks

 

Henry



#85 mich_al

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Posted 01 September 2015 - 07:34 AM

I built a very similar (4 6 x 6 treated timbers bolted together with 10 ft above the concrete footing) pier about 5 years ago.  It is still straight and level but has twisted a little.  I haven't used it much in the last year or so.  When I was using it often I left the mount and OTA attached.  For some reason (temperature/moisture changes ??) the pier would move around enough that alignment would be lost on some days.  I tested this by pointing it at a non-moving object about 300 ft away and looking at where the scope was pointed for several days without moving or powering the mount.  Some days during this test the scope was not centered on target.  I think this is a valid pier design but be aware of these phenomena.




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