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Permanent pier for G11, to Lars..............


Feb 1 5:23 AM

 


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#36192 Feb 1 5:23 AM

Lars,



Our pier, construction seen here,



www.observatorycentral.com/index.php?showtopic=181&st=0



is about 180 cm tall. It is 300 cm diameter. The tube on our 102mm

refractor and the counterweight are often too close to the pier. The

counterweight on the 12" SCT comes even closer. In your case, t'were

me, I'd start with a diameter of 350 cm and use concrete with at least

4 full length pieces of rebar, (drilled and glued to the bedrock with

epoxy). I would get a pier extension like the metal one shown at the

above link (made by our own Rainer) for the top of the pier, so as to

afford maximum clearance for the counterweights and OTA.



Please be sure to post pictures here, and at observatory.com.



Best of Luck with your project.



Steve Durham



--- In Losmandy_users@yahoogroups.com, "lgw09" lgw@...> wrote:

>

> Hi all,

>

> This is perhaps out of topic but have to ask:

> I'm designing a permanent observatory and if I want a long permanent

> pier let say 210cm, approx what diameter is needed (and material

> thickness)? Let say steel put into solid rock, maybe concrete filled.

>

> Best

>

> Lars

>



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