I haven't posted in a very long time, but an older gentleman gave me some
very good advice on 1/2" cutters pulling out. All you have to do is clean
the shank as best you can, then dip the cutter into chalk line chalk to coat
the shank. The chalk absorbs any oil or reside, & is apparently abrasive
enough to help grip the cutter to keep it from pulling out. Hope this helps!
Brian

"Kelly Jones" wrote in message
. ..
Got a problem with my 9 x 42 horizontal - vertical mill (Grizzly).

Actually, probably more a problem with me.

Twice now the end mill has walked out of the collet and made unpleasant
looking marks on the table. Both times when making the cut the whole
machine has vibrated (not badly, but noticably). I have examined the
assembly for looseness, ensured the bolt is tight, and free of burrs and
chips, reduced the feed rate to a crawl, changed the speeds, and made sure
I had a sharp end mill. I really need some new ideas.

thanks