I frequently drill holes on the lathe. I make and sell pens, so all my blanks are drilled on the lathe, holes of various sizes, using the pen drilling jaws of the supernova2 chuck.
It drives me crazy that sometimes the bit doesn't enter the wood centered! Sometimes it is wobbling just a bit right from when it touches the wood, even with a forstner bit. But not always - sometimes it goes through smooth and clean. What would cause it? If it's bad enough, by the time it gets through a blank the whole tailstock is getting shaken around because the bit is being forced to wobble off center.
Any ideas? Does this ever happen to anyone else?