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Just for fun… This video shows Dr. Schmitz (#26 for the Temple Owls, in cherry and white) making a tackle against a UTK receiver in 1990.


This video shows Dr. Schmitz playing against West Virginia University in 1991.


This video shows an example of modulated tool path (MTP) turning. In MTP, a small amplitude and frequency sinusoidal motion is superimposed on the feed motion (within the CNC program) to produce segmented chips. The cutting test was completed by Ryan Copenhaver.


This video shows an animated mode shape (first bending mode) obtained from direct and cross frequency response function measurements completed on a clamped-free-free-free plate. The plate was produced by powder bed manufacturing.

Mode shape example


This video shows self-excited vibration from audio feedback. It is similar to a public address system where microphone squeal can occur. The feedback mechanism in this case is that sound leaves the speaker and enters the microphone with a time delay. In this way, the mathematics are similar to milling, where the time delay is introduced by cutting a surface that was produced by the previous tooth.

Microphone squeal


This video (which begins in slow motion) shows an example of impact testing, where an instrumented hammer is used to excite a structure and a linear transducer, such as a low-mass accelerometer, is used to measure the response. Their ratio in the frequency domain is referred to as a frequency response function, or FRF.


This video demonstrates Bayesian machine learning for milling stability. The vertical axis is axial depth of cut and the horizontal axis is spindle speed. The gray scale is probability of stability (darker means a stable cut is more likely). As experiments are completed (stable or unstable/chatter), the probability is updated using Bayes’ rule. It is observed that it converges to the actual stability limit (green curve at the end of the video). This video was generated in collaboration with Dr. Jaydeep Karandikar, ORNL.

Bayesian machine learning example


This video, which begins at regular speed and then transitions to slow motion, shows a titanium milling operation. We see that the chips are generated and ejected from the cutting zone. The cutting tests were completed by Ryan Copenhaver and Michael Gomez.