Eagle Cast cranks - QA?

Moparmal said
A crank is index ground to correct the distance of each of the rod journals from the axis of the crank - correct?

So I assume that by turning the journals down on a very slight offset from their current location, this moves their "center" slightly so they are all positioned at the correct distance from the central axis of the actual shaft - Im hoping this is correct?
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That would take care of the stroke index, but there's also the swing index (relationship between rod journals such that each piston is timed to its valves in the same way as the other cylinders). This was my motivation for the craptastic diagram somewhere above.