Anti-vibration observatory piers (Part 2: The foundation and fastening of the pier)
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Anti-vibration observatory piers (Part 2, The foundation and fastening of the pier) Ralph Bell continues to talk to Robert J Dalby of Astro Engineering. Produced by The Astronomy and Nature Centre.
Comments
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1 cubic metre of concrete weighs 2.4 metric tons, not 1 metric ton.
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Rubbish. Thats one way to put people off. Use high tech talk for a simple job and over engineer things so you need to spend more cash. Makes me wonder how the Victorians and the rest before them managed. Thats a small observatory so I guess you won't be spending much time in there. More likely sitting at a desk in the warm with the computer taking pictures. If you're taking pictures that makes you a photographer, not an astronomer.
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Why don't you just fill the pier up with concrete to stem vibration?
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Hi - actually the number 160knm is what is known to many high precision industries as a WAG (Wild A**e Guess)! The wrench I used, with difficulty as I had to put a pipe on it to get leverage, clicked over at about 140 before the nuts locked off. I just boosted this number for ‘safety’. I actually regret mentioning any numbers here at all as it has led to confusion. I should have said simply, the nuts need to be done up as hard as you can without wrecking the thread on the studs. KR RJD
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What torque were you saying the bolts had to be at? It sounds like kilograms but did you mean kg.m (160 seems very high) or kg.cm (seems a bit low)
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Hi Dave, no you go ahead, I'm partial to pedantry. Dry or wet? I'd be surprised (not shocked) if the dry weight was over 2 tonnes. In practical terms you start out aiming for a 1m^3 hole but because of tapering (fatigue!) it ends up less anyway. The key is that 1 tonne should be a minimum to aim for. I've only got one real experience with this (n=1!). I once had an experimental container of sand that was a whisker over a cubic metre and it weighed in at under 2 tonnes - wet. KR RJD
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Excellent video
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We're not worthy!
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Outstanding tutorial!!!
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Just to be pedantic chaps, a block of concrete 1m x 1m x 1m (1m^3) is about 2.3 metric tonnes, substantially more than the often quoted "metric tonne" that is quoted in the video. Otherwise an excellent video. DaveGee Australia
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What a difference between the ring, and the thud! Incredible!
8m 1sLenght
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