Getting tear-out - need advice

[Kitwn]

I do use the same trick as I do when cutting steel on the same machine - the final pass is full-depth with a very small step-over and this takes off the burr/whiskers. Both Vectric and Fusion 360 CAM make this easy to do.

Another way to do this in simpler software is to lie about the size of your tool (keep replies clean please!). Tell the first cut that the tool diameter is .4mm larger than it really is and that will give you a .2mm thickness of material to remove with the final pass.

For my fellow Australians I've found Adam's Bits a good supplier of straight flute tools. https://www.endmill.com.au/

Kit