"RicodJour" wrote in message
...
On Aug 8, 3:10 pm, "Josepi" wrote:
Years ago I was attempting to create a CD rack (bored) using an old 3/4"
piece of oak. I was going to dado some exact width slots in it for the
CD's
to stand up and tilt in, using a table mounted router.

After about the third or fourth dado slot I found the router bit came
right
up through the top (backside) of the piece. The router depth locking screw
came loose (or I forgot to tighten it) and the vibration from the table
made
the router gear rack screw itself right up through the 3/4" depth of the
wood instead on holding a 3/8" depth slot. I never figured that was
possible
until I was staring at the 30K RPM bit by my fingers.

Wasted piece of wood (made it shorter) but the lesson was a good one
learned. Nobody got hurt but I never (If I ever did?) put my hands over
top
of the router bit, anymore, no matter how thick the piece is. Pusher
sticks
and distance became paramount.

That's an oddball one. I would have figured the weight of the router
would have caused the whole shebang to drop, not rise. I could see a
loose collet causing the bit to rise. Either way, it's like Sancho
Panza said, "Whether the rock hits the pitcher, or the pitcher hits
the rock, it's bad for the pitcher."

It was very common with Craftsman routers for the bit to raise up but it was
the bit slipping out of the collet rather than the motor defying gravity.