up rate to 60000 rpm spindle

[Chaz]

Responded here to your other thread. Please dont open multiple threads to ask the same question.

http://www.mycncuk.com/threads/13189...h-sub-4mm-bits

To get 60K RPM you need 2 things.

A spindle that can run at that speed.

A VFD that can run at the frequency needed for 60K.

Both are fairly expensive items.