What are you trying to do, a mist system? you need an reservoir under pressure and air coolant mix valve and 1mm nozzle, system pressure 2.5 bar. Datron uses direct pressure liquid pump and 0.4mm? nozzles or sth like that.


aluminum best is done with 2 stage process:
-roughing
-finishing

1 flute or 2 flute, up to three, depends on geometry and slot cut or no.

6mm bit seems to be the best for home use

try something conservative and speed it up / the feed rate/ and or increase the depth pass:
12000RPM, 1.5mm pass depth , 800-900mm/min


kerosene works best, or just mist spray proper coolant mixture


you will do nothing without a coolant, just brake bits


my test show that 4mm tubing/2.5mm inside/ is ok, so it does not matter in your case