End Mills for Max Productivity in 4140HT and harder steels

rabler said:
An interesting video on endmill chatter, breaking taps on youtube. Illustrated with a high frame rate camera and he does some analysis on the magnitude of vibration/displacement in the endmills in chatter situations.
Click to expand...
At T = 7:47, that's exactly what the tool looked like. He said that he encountered a spindle drive fault. I wonder if my spindle drive belt is slipping?
 
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