1mm end mill depth of cut in aluminium.

[JAZZCNC]

Hi Jazz,
I used to cut at 24000 rpm, but got far too much clagging on the cutter. I think the OA cutters make a vast difference as those settings with a cheap chinese carbide end mill just meant el snappo.

You do realize that OA is just bullshit for high helix. All cutters are open architecture.!!

The reason you clagged up was melting because was rubbing rather than cutting because the feed rate was too low. At the lower rpm your not rubbing as much but you still rubbing to some degree which is causing excess wear and a poor finish. It's a common mistake to think melting is because going too fast when it's actually the opposite.
Unfortunately with small tools it's a fine balance between too slow and too fast causing high tool pressure which is what snaps tools. Throw shity material into the mix with it's hard and soft spots plus a slightly wobbly machine and it soon becomes a cluster F'@'K..

Chatter is another problem where going faster can actually reduce chatter by increasing tool pressure which pushes the tool into material harder so reduces chatter. The trick is not overdoing it and lowering the RPM.