Running a RC1325 with the 3 kW air-cooled spindle and I still have not landed on 6061 settings I trust. Single-flute 6 mm upcut is what I have on the shelf, and my current guess of 18000 rpm, 2500 mm/min, 1 mm DOC leaves a gummed-up channel and the chips weld to the flutes before the pass is done.
What I have already tried: dropped to 15000 rpm with roughly the same feed, blew out the cut with the air line between passes, and switched from mist to a bigger flood puddle on the second attempt. Slightly better with flood, still not clean.
For anyone cutting 6061 plate on one of these air-cooled spindles, what DOC and WOC are you actually running, and do you run coolant at all or just air? Curious whether the fix is more feed per tooth or getting the chips out faster. Plate is 10 mm and I am mostly doing pockets and profiling.