"Swingman" wrote in message
...
While not all that common, it happens enough for the average woodworker to
be aware of the possibility. Three things which factor in as a cause most
of the time:

1. Seating the bit's shank too deep in the collet - (always pull it out
about an 1/8" from the bottom before tightening).

2. Dirt, dust, debris, rust, etc. in the collet - (clean collet out with
an old toothbrush and be meticulous ... a new, spanking clean collet will
rarely exhibit this behavior.)

3. Not tightening enough after the proper bit depth is set in the collet -
(crank the crap out of it ... PC's with two wrenches need some rice and
gravy in the wielding).

4. Possibly, PC is now contracting Craftsman to build this router. ;~)