60 foot diameter vertical boring mill
Mar 19, 2010· The largest vertical boring mill I've seen in the flesh was a Craven 42 ft diameter machine. This was impressively large, so I was amazed to learn that GE in the USA had a 60 ft VBM in about 1902. I recently came across some information about it. Turns out it wasn't as beefy as its capacity might imply, but the concept was very interesting.