TPU Clue:
I happen to be working on a device for another project that has a disk that can both rotate on its Z axis and vibrate ( stroke ) on its Z axis. Both of these cycles are variable.
So.... I decided to do a little of my own after hours testing on the washboard effect.
With the device spinning on a calibrated surface, pushing the base of the device in one direction with the end of a digital force gauge, I could not get any washboard effect.
Picking the device up and tilting produced gyroscopic effect.
With the device vibrating on a calibrated surface, pushing the base of the device in one direction with the end of a digital force gauge, I could get noticeable washboard effect.
Picking the device up and tilting produced gyroscopic effect.
My theory is the motion in the TPU is in the Z axis.
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