Interesting,

Just calculated the speeds for a 2mm cutter in 6061T6 and it seems I am seriously under-using carbide anyway.

In Carbide, at full speed it needs 82,000rpm, HSS wants 23,000rpm

The reason I had not seen the high speed before was because I limited HSMAdvisor to calculate feeds based on my limit of 24,000rpm, removing this limit shows the full feed & speeds.

Anyone got an 82,000rpm spindle? :)

Anyway, HSS will do the job at say 6000rpm but it will be much slower.