[naspc]

I would say that a true fly cutter is out of the question. The torque required to take the cut would bog down or stall your spindle. I would say you would be limited to 3/8” and under tools with 1/4” being best. You can shove a 1/2” tool in an ER20 collet, but you need the machine rigidity to make it cut well.

For facing, I used to use a 3/4” flat trim router bit. It left mirror finishes on aluminum and can take the speed.

Rather than focusing on what a high speed spindle can’t do, try to take advantage of what they are designed for: high speed cutting with smaller tools.


As far as collets. Get a set 1/8”-1/2” by 1/8’s. That should cover you for most tools. If you get a set of metric ones you will be hard pressed to find anything you can’t hold. Don’t buy junk collets as the runout will destroy your tools.

I was thinking g or getting a set of collets from Maritools.