Quote:
Originally Posted by gregbradley
Depending on your setup even piers can go off over time due to wet weather, dry weather affecting soil and it can create stresses in the soil that could shift a slab slighty or a pier.
I have not particularly noticed that with my setup but my pad is 1 metre deep x 800 square of concrete with lots of steel and a large flange of concrete on the top level.
But if my guiding started to go off the first things I would check apart from the usual guiding settings would be balance, cables, polar alignment - the physical side of the setup.
A quick 30 point t-point model would show if PA is off. I think you can save the existing model if it is large and reinstate it if PA turned out to be fine.
Greg.
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Thanks Greg, this is exactly what I will do. I did read on SB just today that PA can be of by as much as 5 arcmin and one should still be able to guide just fine, but who knows, maybe the bolts holding my pier down have loosened. I'm also going to investigate through the mount cables...
Peter