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March 3, 2009 - 4:15am
#1
VPI SSM review with Rim Drive
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Your intial prolem would seem to be related to the table and motor sharing the same support system. Use the Ginko supporting only the table and the motor should be isolated from that support system. This would change the resonant frequency of the system and you would want to adjust the number of balls under the table. If you didn't changed the support system when you addded the rim drive, this could be part of your problem with that set up.
Separating both is not really practical, as the motor/rim drive has to be in contact with the platter. As I mentionned, I had no such issues with the same motor drive using belts on the Ginko. I think there must either be a non-uniform weight distribution in the rim drive or the contact surface between it and the platter has a small bump. I agree that, due to its floating nature, the Ginko is exaggerating the wobble and this would be much reduced if I removed it entirely. However, you would still have the out-of-balance forces there.
I am using the maximum number of balls, as recommended by Ginko. I understand that the number is dependent on the weight of the equipment above it.
I don't understand why this would still be out of balance. Can you not build up a rigid subplatform for the motor assembly to sit on? To raise it to the correct height for the Ginko suspended table? If you want to stay with the Ginko, I would think this is your solution.
Otherwise, let me suggest you move to tennis balls from the sporting goods store in place of the Ginko O.E.M. balls. The tennis balls have a different structure with a "tighter", higher tension surface that provides less give. Less give should mean less lateral sway. I think you are getting into mixing upgrades and one has not caught up to the other. Experimentation on your part is in order here. You might try cutting the tennis balls in half to provide an even more stable platform with virtually the same benefits as complete units.
Alternatively, you might look at Stephen Scharf's thread on his DIY isolation cups. I believe it's in the "tweaks" section or you can find it by calling up his name and clicking on all of his posts. Check his "Rega table" thread also for another solution I provided that SS seems to agree works quite well.
Finally, I would say if neither of these two options appeals to you, you might want to move the table to a sandbox type isolation platform until Ginko catches up with VPI's upgrades. If you're concerned about the sand floating around the table, which I don't think it can but some people believe it's dangerous when it's just sitting there with nothing on its mind and nothing to do but isolate, isolate, isolate, use a plastic zip lock bag to contain the sand.