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What does it look like when an endmill starts chattering? How about at 20,000 frames-per-second? I'm in the shop playing with a high speed camera, filming Online Carbide 1/4" 4FL variable helix end mill on mild steel with my AvidCNC Benchtop Pro.

Really amazing footage, pretty impressive to see the workpiece, vice and spindle/endmill moving around so much!

0:00 Intro
0:56 Test setup
1:17 Stable cut at 19000 FPS
2:06 Chattering cut
3:52 Motion detection (frame differencing)
4:22 Deflection analysis
5:03 Head-on shot
5:29 More chatter
6:03 Aggressive cutting
6:34 Breaking endmills
8:41 Four minutes of 20,000 FPS Footage :)