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newbie alert

Pier footings concrete ratio

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A millimetre is a quite a large deviation when you are imaging at <0.5  arcsec per pixel...😄

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14 minutes ago, tomato said:

A millimetre is a quite a large deviation when you are imaging at <0.5  arcsec per pixel...😄

Then please show me a picture of your ten tons of kit.... 😂😂

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1 hour ago, WanderingEye said:

True, rigs get heavier, but not to that extent, the size of concrete you are talking about (1 cubic metre) would hold a ship in port....you would need somewhere in the region of ten tons of force to even move that block a mm.... 😀

 

I'm not passionate about that amount of concrete either but I know of a guy that knows when his area has a earth tremor as he has to slightly adjust his PA..

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I do think a large block of concrete would make an excellent earthquake detector, a few years ago I had a very minor quake that shook the walls of the house and dislodged ornaments so ran outside to find the the ground completely still...

Alan

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18 hours ago, WanderingEye said:

Then please show me a picture of your ten tons of kit.... 😂😂

Here you are, sorry but this was worth putting a cubic metre of concrete under it, and I ain’t taking any out for anybody.😎

444F4BA1-0568-4486-A086-4B45F3E4C9B3.jpeg

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Did 0.5 m3 on my first build and that was far too much. There shouldn't be any forces on a well balanced scope, I'd maybe aim for a weight of concrete that is a few times the weight of your gear.

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I'd add that the cost of removal and disposal is far greater than the cost of pouring it in the first place.

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