Is there anything you dont now Irving?

The only advice I can can give is to get the right cutter. I started using some old end mills that I got as job lot, good condition and sharp, but the results were poor, 1mm DOC and the sides had burrs.

Then I got the Alumex??? ,or some thing like that, especialy for Ali (different helix I think) and the difference was really noticeable, sharp edges and 3mm DOC. I've now got flex issues with the machine to sort out. but thats another story :whistling:

Note. my spindle speed and feedrate were a lot lower than yours, dont now any figures just that it worked.