Z axis TPU

Author Topic: Z axis TPU (Read 6039 times)

darkspeed	Z axis TPU « on: 2010-01-09, 22:13:28 »
Group: Guest	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.

Grumpy	Re: Z axis TPU « Reply #1 on: 2010-01-10, 01:39:13 »
Group: Tinkerer Hero Member Posts: 3947 tExB=qr	Quote from: darkspeed on 2010-01-09, 22:13:28 My theory is the motion in the TPU is in the Z axis. "motion" of what?

darkspeed	Re: Z axis TPU « Reply #2 on: 2010-01-10, 02:35:51 »
Group: Guest	Well that is the question.. In the video when he sets the TPU down edgewise it has a very small contact patch with the large free surface area of the glass and there is a very distinct screetch around 6khz. If the motion was in the Z axis at 6khz then it would resonate aginst the glass as it made contact turning the table top into a speaker. I think it did. The distance traveled in the Z axis at 6khz would be hard to perceive but take a ring of a few turns of bailing wire, hot glue it to a speaker cone near the outer surround, feed it a 6khz signal and you will feel a slight vibration, gyroscopic resistance, and if lucky a little washboard across a calibrated surface. I would assume three coils with two " near " the same frequency and one out of phase " at any given moment " will give you this motion in the Z