Clearaudio use ceramic pipe.The ceramic shaft has no ball bearing at the top side.
I will use this bearing in my DIY project. It seems like the work will take a lot of time, and of course I will publish some pics.
Master reference's platter height 80mm, weight ~8 kilogram , out limiter clamp ~1,5 kg, record clamps ~0.3-.0.4 kg total weight ~ 10 kg
After replacing CMB bearing platter literally float on air.
Watch this video
http://www.youtube.com/watch?v=EJOKzC3QJW8
http://www.youtube.com/watch?v=9GqIoMqqkys
An externally hosted image should be here but it was not working when we last tested it.
I will use this bearing in my DIY project. It seems like the work will take a lot of time, and of course I will publish some pics.
Master reference's platter height 80mm, weight ~8 kilogram , out limiter clamp ~1,5 kg, record clamps ~0.3-.0.4 kg total weight ~ 10 kg
After replacing CMB bearing platter literally float on air.
Watch this video
http://www.youtube.com/watch?v=EJOKzC3QJW8
http://www.youtube.com/watch?v=9GqIoMqqkys
Thanks for the pigs. The video’s are quite impressive. It floats on air. Seeing this video I think I have to redraw my earlier remark that a magnetic bearing has no less resistance than a inverted bearing. And afterwards resistance is mostly heat and noise. So less resistance, less noise.
Can you estimate how many mm the magnets are apart from each other with platter and record on top?
Can you estimate how many mm the magnets are apart from each other with platter and record on top?
YNWOAN said:Excellent, many thanks
Could I also ask how far appart they are before the weight of the platter is on them?
~11mm.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
electromagnet
Why don't we use an electromagnet as the static (bottom) magnet? Then the strength of the magnetic field can be easily varied. We then can easily measure the difference in wow and flutter with varying pressure on the thrust plate. Would be interesting.
This of course leads to the question: is it possible or even easy to design a circular electromagnet. Will the magnetic field be more homogeneous than with a static magnet or the opposite?
Marco
Why don't we use an electromagnet as the static (bottom) magnet? Then the strength of the magnetic field can be easily varied. We then can easily measure the difference in wow and flutter with varying pressure on the thrust plate. Would be interesting.
This of course leads to the question: is it possible or even easy to design a circular electromagnet. Will the magnetic field be more homogeneous than with a static magnet or the opposite?
Marco
That's what I call "new territory"
.It proves to be quit difficult to make a large ring electromagnet to carry the platter. Now I'm thinking off an circular array off small electromagnets.
If I put 20 small super magnets under the platter, and 20 small electromagnets on the base I could even drive the platter with a approx. 10 Hz AC signal. I'm affraid that that would give nice unwanted resonances in the vertical so at first I'll try with DC electromagnets (or even normal super magnets).
MArco
Yes, and then angled so that one is lifting, and one is facing inward:
---...............................---
.+................................+.
---|+|....................|+| ---
(+ = a magnet field; -- or | is a magnet . is a placeholder for this drawing)
Tempting, very tempting, but a lot of work.
MArco
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