> > 4) One recommendation for tightening collets suggested 1/4 turn after
> > the drawbar snugs up. In your experience is this adequate for holding
> > end mills such that they don't climb out of the collet or should I
> > always use end mill holders instead of collets?
> These are relatively light duty mills. IMHO, any job with enough vibration to suck an end mill out of a collet has pushed the performance envelope too far.
> I wouldn't recommend dedicated EM holders. These bench top mills don't have too much rigidity. I think an R-8 collet will allow you to choke up with the least overhang better than a dedicated EM holder.
I have had an endmill creep out of a collet and ruin 2 hours work - because light cuts take longer and provide more opportunity for the endmill to creep. I now only use dedicated EM holders without difficulty - and I can take heavier cuts.
There is always one side that says "use collets" and another that says "EM holders". You get to choose what to do on your machine.