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Old 22-06-2015, 05:31 PM
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gregbradley
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Join Date: Feb 2006
Location: Sydney
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Quote:
Originally Posted by PRejto View Post
More of a thought bubble than anything else, but assuming perfect balance weight wise on each side the only difference would be a considerably different moment due to the scope length from east side to west side. But, why that might matter is not at all clear to me except possibly to note that on one side the larger moment is being lifted, the other lowering. I wonder what you might see if you turned off declination guiding? Any difference from side to side when the only corrections are in RA?

Peter

Ah yes that might explain it. With the OTA on the west with it pointing to the east the counterweights are being lifted (I have make it slightly imbalanced to the east to prevent oscillations) and when OTA is on the east and the counterweight is lowering and the imbalance is causing it to press down very slightly but in the opposite direction. Maybe slight backlash?? It was only a slight difference. Both gave round stars, but on OTA on the east looking west gave slightly rounder stars.

Greg.


Quote:
Originally Posted by Joshua Bunn View Post
It's magic when it's all going well, hey Greg.
Maybe your setup is counterweight heavy, the worm lifting the gear? Not that I think it's any difference on a Paramount...

Josh
It was a very slight difference Josh so its probably more to do with some slight flex in something or tiny backlash.

Greg.
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