I found a video today and it reminded me of this thread and you. It's on enginelab.com and they show a 5 minute video of some of the operations in making a crank from the raw forging. It is a vomitwagon crank for some super car deal, but what I found interesting is that they undercut both the rod throws and the mains. And they do it with a tool. I was told Chrysler rolled the undercuts on their cranks but this was done with a tool.
As a machinist myself I was interested and thought you may be too. Also I found interesting the induction hardening process. Very cool.
I'm an idiot so I can't post a link, but it should be on the from page of the web site, as it was just posted today.
Check it out. Very cool.
