Fortunately, there's a guy about 20 miles from me who has been grinding crankshafts for me for about 30 years. If he ever decides to retire, I'm not sure what I'll do, but he's a few years younger than I am and he's got a son primed to take over the shop. Here's a little anecdote from back in the mid-1980's- - - -I had sent an Olds 455 crankshaft in for an index and regrind job. My buddy called me up to tell me about a blemish in the shaft and asked me if I'd like to grind the rod journals down another .010" to clean it up. Here's the conversation:
Him: "There's a little low spot on one of the rod journals- - - -do you want to go 20 under instead of 10?"
Me: "How big is the spot, and how low is it"?
Him: "It's about as big as a pencil eraser, and it's .0002" low
Me: "That's a strand of hair sliced 10 times- - - -I think I'll run it like it is!"
I never had any reason to question his work after that!
Jerry