1mm end mill depth of cut in aluminium.

[cropwell]

I recently visited a place in Leeds who engrave and cut with tiny cutters using 100k+ HF spindles and what came off was like a fine grinding paste. Would you believe they hardly break cutters from actually cutting, they break them mostly when replacing or catching on stuff. However, they grind there own so it's no big deal to them.

Amazing, I visited a place that drilled stainless steel filter discs for a certain phamaceutical company in Nottingham. Their finest holes were much smaller than a human hair and they were using carbide drills on a 1/8 shank. They wouldn't give me info on the feeds and speeds though.