Milling Sheet Aluminium

[Jonathan]

Thnaks for the advice. I'll try slowing the spindle, but the slowest I can go is 150Hz which is 9000rpm

Is that one of the 2.2kW water cooled spindles? If so you can go lower, it'll just be the minimum frequency setting on the VFD that needs changing. Don't expect much power though if you do change it.

When you oil the cutter, what exactly do you mean. Sorry if its a dumb question.

Just means put coolant on it - ideally lots if you're having problems.

You may also want to try a single flute cutter, more room for chips etc.