Mate, great big gnarley machines that chew up even bigger lumps of metal would fascinate any bloke worth his salt. I think the one your on about was machining down some BIG bit of flanged pipe. It went round and round and round...... lol
The other one I really enjoyed watching was the size of a tennis court, some sort of plane? Big flat bed and the business end travelled up and down it. As everyone has by now probably guessed I know bugger all about Machinery work, but I do know John N so I can only learn
