Micro SX-8000 II or SZ-1

Mark,
Thanks for posting. I had not seen your first post when I wrote and i had not looked at the VK page linked. I was noting the mass moment of inertia of a solid with zero angular velocity (which is the way all Japanese TT specs historically have shown their mass moment of inertia spec - which if I'm reading your idea correctly, reconciles with your recalc above because the coefficient of the square of the gearing is... 1.

When I think about it, when my Exclusive P3's capacitors went, it was probably going something like 750rpm too (until I shut it down). If I could harness that and use the spindle, I could have gotten something like 1000 tons/cm^2 (a lot more weight and much bigger r^2).

I will go away and digest some of this.

As to the Saskia, I had previously read the 'effective mass of 200lbs' bit on the OMA homepage, but as there is no other information, and I have not seen any other info on the table elsewhere, it is difficult for those of us less in the know to understand how that comes about. I will assume (and we all know what people say about that), that the

tightly controlled external rotor motor when combined with the turntable's heavy platter results in an effective mass of well over two hundred pounds

means that "because it is rim drive not belt drive, when combined with a platter of X mass, we get effective mass of X+Y mass." There is so little information on the OMA page that anyone with a modicum of info could probably see where I am wrong on this too, but I couldn't quickly find any info months ago when I first looked.

T Bone

The equivalent mass given by OMA is calculated according to the method I used.

It's not the mass of a platter equivalent to the total inertia of the system, this would be even higher (around 400 lbs). IIRC Win decided to use the more conservative figure - he's a big believer in understating and over-achieving.

Mark Kelly

Mark, I understand the calculation but do not understand (from reading the webpage) where the 'gearing coefficient' comes from - higher speed flywheel providing gearing vs 33.3? rim-weighted platter increasing effective rotational inertia when compared to solid mass?

Let's not turn this into a discussion of Saskia, it's meant to be about the Micro Seikis. I used it as an example only.

Thuchan, there is a standalone Micro Seiki product called the HS-80, which was a high-speed inertia unit (made to be added to the 1500/5000/8000 series models). It would probably give much the same effect to the SX-8000 as the motor on the SZ-1 accomplishes. When they come up in the market, they are seriously expensive, but they are probably easier to find than an SZ-1.

You can see a picture here (about halfway down the page).