SS Great Britain propeller shaft forging
Appears in 2 lectures.
Appearances across the corpus
Carl corrected Tom's earlier reference to "Kingdom Brunell" — Isambard Kingdom Brunel was the engineer behind a huge 1830s ship. Tom is correcting his own attribution from a prior lecture's case.
So far as that goes, Carl pointed out to me that when I was talking about this press and the thirty-inch diameter cast iron shaft — Kingdom Brunel is not a kingdom, it's a person. It's Isard Kingdom Brunel [Isambard Kingdom Brunel]. I thought maybe this was someplace in the Middle East, but it's actually the engineer who designed this huge ship in the 1830s. So there's a correction to that. I'd never heard of him, but Carl had heard of it somewhere and finally Googled it and corrected me, so I appreciate that.
James Nasmyth's painting of his patented steam hammer forging a 30-inch wrought-iron propeller shaft for Brunel's SS Great Britain. Tom uses the V-shaped anvil visible in the painting to make a delta/triaxial-stress point.
I want to show you one other thing. This is James Nasmyth's painting of his patented steam hammer forging the propeller shafts. This is a 30-inch diameter shaft for Brunel's SS Great Britain — it was going to be one of the largest ships. These were the largest wrought-iron forgings of their day. It was just a steam hammer, big steam cylinder up here, and they're going to take an ingot of wrought iron. This isn't even steel technology, this is wrought iron. Look at the manipulator they have back here — count them, there are actual men moving this thing. You've got an anvil right here. Notice the shape of that anvil — it's V-shaped. Remember, I showed you the picture of how you don't want to do deformation at delta of 5 with just two platens coming together, because you'll crack the inside — it goes into tension. But if you do it from three sides with a V-shaped anvil, you actually get compression in the center, and you don't cause splits in the center. 1839 — they had studied Backofen, they knew all about delta, and that's why they were using their V-shaped anvils.