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The Pier Expansion

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Check this screenshot out. I'd polar aligned and was getting great alignment. I turn on the air conditioner inside my observatory to get the camera down to minus 20 and the PA plot goes crazy. This tells me that I either need to ensure the inside of the observatory is always at the same temperature (pretty hard to do in Australia during summer) or that I need to cool down the pier to a specific  temp  whenever I perform PA.

In the plot below, where the graph begins to go up, that is the moment I turned on my air conditioner. I had no idea my pier was so temperamental. 

Pier Contraction.JPG

Ideas on how to solve this welcome.

Ray

 

 

 

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Turning the air conditioner off has the opposite effect, almost instantaneously. Very surprised how easily the pier loses PA with temperature.

Pier Contraction.JPG

Ray

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Might explain your recent problems mate. Between movement when extended and changes with temp. I would ditch that pier for a more standard design.

 

Shane

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Might have to design with a material that hardly expands. Not sure what the Invar cost will be, but I'll do some digging. 

Ray

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