I have decided to dial way down this time. Again, I am making a mold
cavity in aluminum for making a kids wax toy (toy railroad supports).

This time I am using 1200 RPM and 1 IPM, and in addition I use WD-40.

The good news is that nothing gums up, the bad news is that the speed
is ridiculously slow. Yes, it is CNC, but still.

Next thing on my list is getting coolant to work. I have a
professional coolant tank with motor etc and also a little 1/70 HP
pump that works great in plastic buckets. I think that I will use the
latter Then I can go at the same 1200 RPM but at much higher feeds.

i