Hey Stan you'd be surprised how many hi-tech research labs that practice carries over into;) I think it's officially called "wobb-ulation" (an old-timer told me that 30yrs ago)

-Reamers are used to enlarge a hole previously drilled or punched, where you have no center to base off of..it self-centers into the existing hole..Big-time Morse Taper #4 and #5 like these would take 5hp and up gear driven machine to drive it..chips, oil and SMOKE! That and a cold beer and I'm up for watching the show