machining aluminium with 1.5kW spindle

[JAZZCNC]

Generally speaking the best speed for aluminum is 8000 rpm. Thats what my tests show. 25 ipm feedrate is good feedrate to start with. No coolant or soap water or sprayed alcohol via airbrush.

That's far too general and you can't say "Best Speed" because there is no "one" best speed for cutting aluminium there are far to many factors come into play which determine the speed.!! . . . . Material grade, cutter size, No flutes, DOC, Cut type ie: slot or side cutting, step over, coolant type . . . .And thats before you get into Spindle power and machine strength.

Can tell thou 100% There is no ONE speed does all and you'll fluctuate between 7-15K when cutting ALi with 4-10mm tooling with varying no of flutes and DOC & S/F etc.

Experiment is the best way to learn speeds & feeds and dont be affraid to cut deep, just be prepared and accept that you will break tools while finding the best cutting conditions for your machine and material.