"Steve Lusardi" wrote in message
...
Bruce,
That can only happen if your tapers are worn out/ not locking properly. Of
course this does happen in a mill, but you have draw bars to counter that.
It should never happen in a lathe, because the forces are not high enough.
If it does, the most likely culprit is excessive back lash in the
tailstock screw. This tendency can be somewhat countered by tightening the
tailstock spindle drag/ lock lever. Abusing the grind on a drill bit is a
bandaid, not a cure.
Steve



the key thing you added, above, was "drawbar" - OP doesn't seem to have
one - adding a drawbar might solve the problem, but most metal lathes I'm
familiar with don't have a way to add a drawbar to the tailstock. Boring
rather than drilling will also fix it



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