Tables That Feature Bearing Friction

Dertonarm, before you go, what specific test/thickness of aramid or dyneema do you recommend, and what type of knot do you use? I have something like the no-force platter bearing & thread drive sytem you describe(though achieved by means other than dual motors) and would like to try your threads.

Dertonarm,

The complex system I have been referring to IS the turntable. I don't believe you are really this thick-headed. I believe you are just looking for a flame war. Try AudioAsylum, they love that stuff over there.

Well Dan_Ed, you might see it as a complex system. It is to some extend - as I have mentioned before. But not all that bad.
Flame war ? No, I am after results - not opinions.
But it seems very hard to get the message out.

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- possible highest platter weight
- possible to use high inertia for self-stabilized speed
At least the last two reasons can not be used with idler or dd drives. ###

Wow you are dead wrong about this. The Rockport Sirius is direct drive and uses a 62 lbs. platter. The Certus DD turntable uses a 60 - 75 lbs platter. The Verus rim drive motor has been used (with excellent results) with platters up to 70 lbs. There is no reason practical or otherwise that limits direct or idler motors to light weight platters. The Certus motor is more than capable of driving a platter well in excess of 100 lbs.

BTW: we have done direct comparisons using the exact same 75 lbs. platter with belt and direct and rim drive. They all sounded considerably different and the belt drive was the clear loser.

Your heavy platter, slipping string design is one of many possible approaches to turntable design. But

- it is not the only correct way
- it is not the only concept that "agrees with physics"
- it is not an idea that cannot be improved on
- it is not without compromise
- in my experience the slipping string part of the design
is inferior
- the heavy platter part I agree with, but others can make
credible arguments for a light and responsive platter.

I have have no problem with disagreement. In fact it can be a lot of fun and enlightening. But the constant demeaning of dissenting opinions has gotten old. I am done...

Dear Jloveys, teh Verdier Magnum has some very interesting points. The oil pressure bearing is an extremely good solution for a bearing which is both - able to handle very high platter weight AND provides a very low friction and extremely high damping. Very good. The platter features super high inertia (the large diameter...) but would even be better with an internal damping or a compound (3-5 cm metacrylat or vinyl on top of the platter and at the underside too. thus the platter would be dead quiet and teh vinyl record would see a contact surface with identical density - which is optimal). I see some room for mprovement in the suspension and in a possible counterspindle to make the bearing vector/force free. But it sure is a serious machine with several very strong points and going in the right direction - super high inertia, super high mass in motion .......