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[ngwagwa]

You are going a bit too slow and the tool stick out is way too far. You'll get an even better finish if you lower the stickout and up the feed.

The cutter is a 2mm extended neck ball nose and the 4mm shank is flush with the collet. I have to use a 20mm long tool as the next size down (10mm) is too short. As for the feed rate I run them at the recommended 210mm/min but in this case as the slot is only 2.059 wide I prefer to reduce the feed