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VPI Rim Drive vibrations

I have VPI SSM with RIM drive and SDS. The issue I'm having is a vibration being transferred from rim to the desk/platter. As the result tonarm wobbles a little bit in azimuth plane.
I tried to replace the brownish rim belt, change contact force/distance between the drive and the platter, and reinstall the belt - the vibration still there (exactly one wobble per rim's full revolution - 360 degrees).

The speed stability is very good though - have checked it with KAB Speed Strobe.

Any ideas how to resolve the issue?

Thanks a lot!
krell303
krell303 OP
40 posts
 
Stringreen...I have hardwood floor in my listening room and the basement under it. Both do not make a sound foundation for the table. Before SSM I had VPI Scout wall mounted on Target shelf - no issues with vibration whatsoever. Unfortunately SSM with Rim drive is just too big and heavy for the Target shelf.

Now I put back original feet and running the table non-stop for 24 hrs trying to sit the rim's o-ring belt more/less evenly
stringreen's avatar
stringreen
6,480 posts
 
Krell303...Running the table for 10 years won't help it. you need Bearpaws or something similar to eliminate the wobble. If you have wooden floors, I would make sure that the table that the VPI rests on is very solid...that's about all you can do. I am quite sure that would be enough.
krell303 OP
40 posts
 
Adventure in audio space – Part 2.

I spoke to Symposium Acoustics (they are located not so far away from me in NJ) and have decided to try Symposium Acoustics Ultra Platform shelf – put it on the set of three Roller Blocks Jr on top of my rack. Ultra Platform supposed (hopefully) mto eliminate microphonic effect introduced by hard pointed TerraCones and at the same time to eliminate lateral vibrations from floor.
To be continued.
hiendmuse
257 posts
 
Krell,

I have the VPI SSM with rimdrive and Edensound Bear Paws which sit on a Symposium Acoustics Ultra shelf. I strongly recommend that you do NOT use the roller blocks under the Symposium Ultra shelf for your VPI SSM rimdrive. The Ultra shelf is superb, but you do not want any lateral movement which can cause problems with tonearm rocking which can be transmitted by the roller blocks. The roller blocks are excellent under a CD transport.
stringreen's avatar
stringreen
6,480 posts
 
Hiedmuse is absolutely correct. The reason for the Bearpaws is to eliminate any movement whatsover. Rollerblocks will only make it worse.
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