Re: 1200GTO without OTA's


Dec 7, 2001

 


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#4081 Dec 7, 2001

Hi Roland, hi Marj,



Good to hear your holidays turned out great. Nice to have you back.



I am setting up my newly acquired 1200GTO in it's permanent roll-off

roof observatory here and a doubt crossed my mind:

My plan is to take my OTA's to the observing site and afterwards back

home.

Is it OK to leave the 1200GTO for long periods of time - could be

weeks - without the scopes mounted (155EDFS + Traveler), however with

the counterweights left on ? The mount would be in the counterweights-

down-position of course. I am worried about the constant relatively

large moment arm (leverage) on the dovetail RA-declination joint

resp. on the RA gear.



Greetings from summer.



Daniel

Santiago - Chile



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#4082 Dec 7, 2001

In a message dated 12/7/2001 10:35:39 AM Pacific Standard Time,

daniel@... writes:



> I am worried about the constant relatively

> large moment arm (leverage) on the dovetail RA-declination joint

> resp. on the RA gear.

>



No problem. The dovetail joint can easily withstand this load indefinitely,

and there will be no effect on the RA gear. The polar axis is built to take

large amounts of moment arm loading whether it comes from scope or

counterweights or both makes no difference. The only thing that would be

affected is the load on the motors should you decide to slew the polar axis

without the scope. The motors would then be asked to lift the weights up at

the end of the countershaft, and this amount of unbalance they cannot handle.



Roland Christen





[Non-text portions of this message have been removed]



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#4083 Dec 7, 2001

--- In ap-gto@y..., chris1011@a... wrote: > The only thing that would be

> affected is the load on the motors should you decide to slew the

polar axis > without the scope. The motors would then be asked to lift the

weights up at > the end of the countershaft, and this amount of unbalance they

cannot handle. >

> Roland Christen



Thanks Roland,



I hadn't even begun to think about activating motors without having

the mount reasonably balanced.... gives me goose-bumps ;-)



Daniel



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