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ducatirider wrote:

a load on the side of the bearing could cause an elliptical rotation.  since we are dealing with micro-engineering the effect is likely audible.   Arthur Khoubesserian of Funk Firm uses a single motor with 2 additional pulleys to even out the lateral bearing force.  this idea eliminates the need for 3 motor synchronization.

Yep, I never was a big fun of 3-motor synchronization; in fact I feel that multi-motor idea is very bogus. If to pretend that we do have elliptical rotation then the fact itself that we have it is not a big deal. The bad thing is beating of spherical axis from one side of elliptical to another during the palter spinning. If a spherical axis has elliptical freedom but sits in one side of ellipse then it would be as good as no elliptical beating is available.

Fist I feel that an idea of a single motor itself is something that would keep a spherical axis leaned to one side of a hypothetical elliptical wearing of out bearing. The moment is continually applied to one side of platter effectively “biasing” the platter. There is way to take this presses further – introducing an artificial “brake” on another side of platter (or at any side at this meter). That brake acts like a mechanical grounding rod – it forces the spherical axis to sit very firm in elliptical corner. It also makes the driving belt from motor to work harder. By adjusting the force of the brake (mass of the pulleys, their driving diameter or whatever) it is possible to fine-tine the rotation system. Micro had this done with passive horoscope then the suggested to drive of the main platter. I like the idea but I feel it is very bulky.

What I experimented and go very good result was “suck out roller”. It was a soft rubber roller that was running off my driven by belt platter where the tension on the roller’s bearing was enough to bias out my platter. I was able to measure the fact the platter “sees” the roller. The Idea worked very well; however, I have to admit the all of it had no effect to auditable result. Eventually I returned back to just a simple and no fancy mass load platter with a single motor and loose belt…

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