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TW Raven Owners: Set Up Questions

Through the magic of sweet talk, I turned my Orbe into a Raven and mounted my Graham 2.2/Benz LP.
I am looking for a isolation base for the Raven. I have a 1 3/8" piece of granite coming soon so I can ditch the MDF I use now (a temp. meas.!) Symposium, SRA, HRS, etc., can anyone share their experiences with isolation bases? I saw the thread about loosening the Stillpoints.
Initially I had an issue with using the rough side of belt. The belt shimmied up/down on the pulley at a specific spot on belt. Also, the speed fluctuated and I could never get it dialed in with the PSU. So, I went to the smooth side of the belt and then raising the back side of the motor (unscrewing one of the isolation feet) slightly moving the belt down from "center" on the pulley. This moved me from 33.2 to 33.3 and I have no more belt shimmying and the speed is rock solid.
I'd appreciate any tips/tricks etc.
gerardff
syntax's avatar
syntax
2,193 posts
 
I am very confident that 3-5 Shakti Stones below, Shakti Online, teleportation tweak, liquid ceramic cables, clever clocks or brilliant pebbles will raise the table far above ultimate level.
ebm
9,311 posts
 
Shakti stone will take away air not a good tweak.
peterayer
1,382 posts
 
Ebm, it's engineering and Halcro sounds like an architect. I understand about these prestressed concrete slabs. They are thin, and do flex, but they don't break under the design load. Think of a very hard, yet bouncy web. I imagine that they could even ring under certain loads.

Suteetat's apartment floor slab does not at all behave like a thick concrete slab on the ground. Whether or not a wall shelf would be better in his situation, I can not say.
suteetat
435 posts
 
I don't know anything about concrete floor, bounce and such. The concrete floor is 30cm thick, is that thick or thin I have no idea though. Since it can support 400 kg/m2, how much weight or force do you need to make it bounce?
peterayer
1,382 posts
 
Suteetat, I can't answer that. And I'm not sure you will ever get your floor to flex. I'm just saying that Halcro is describing a type of pre-stressed concrete slab and it will not behave like a standard concrete slab located on the ground. You may not have any issues at all.

However, if you can borrow a Vibraplane or other serious isolation platform for you unsuspended turntable, you should hear quite an improvement in information retrieval or resolution.
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