Hi Barry

How deep is deep holes, ? for just a couple or three four five six
inches, in dry straight grained wood a forstner bid should do just fine,
backing it out every half inch or so, the problem with most of the
extensions is that they are a floppy fit, but if you first go the max.
with the bid without the extension you might still be OK, if you plan to
go for 10" or 12" or more you should go with a D drill bit like Leif
suggest, and I would drill the hole first before shaping the outside so
if you are off center a hair it would not matter, O yes keep the speed
way down.

Have fun and take care
Leo Van Der Loo

Barry N. Turner wrote:
Can someone give me some tips on boring deep holes for pepper mills? I plan
on using Forstner bits with extensions and boring on the lathe. Anything
else I should do of be wary of? Thanks.

Barry