Hi Washout,
I liked your videos, Thumbs Up. The 5th video is perfect, That's how I want to be cutting aluminium. I don't think I will use your method for testing how sharp the end mill is, It's a bit messy. Can you tell me the plunge rate you have on the 5th video, and I take it as your using the full rate as you ramp down? and you only use the 30% if you were plunging a hole with an end mill instead of a drill bit.