In article , Len S wrote:

Some have said that on *really* heavy work and end mill can be
"sucked" out of a collet - a small amount, but enought to ruin a
precise job. I have not seen this, but also don't anything super
heavy.

It doesn't need to be heavy. It's happened to me twice, and not too long
ago it happened to the foreman at work. He immediately bought a set of
endmill holders.

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Mike Graham | Metalworker, rustic, part-time zealot.
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http://www.metalmangler.com| Caledon, Ontario, Canada