The Mark & Juanita entity posted thusly:

On Fri, 21 Jul 2006 23:28:25 -0500, "sweetsawdust"
wrote:

No dust, No screeching, Everything was going smoothly with no problems and
then BANG it happened. I have performed this operation several times with
no problems. This time was a bit different and exciting.

Is it possible there was something inside the wood you were drilling?
Some piece of metal or something else that, not so much causing an
explosion, but something that caught and caused a "kickback" so to speak? I
know you indicate you smelled smoke and charring, but that is sometimes
normal with high speeds and/or dull bits in hard woods.

Something in the wood could also cause a spark. I used to see
occasional sparks from calcium inclusions when cutting teak. No idea
if oak can have the same, though.