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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

Showing 1 response by gja

gja
1 posts
 
Krell303

I went through a similar issue converting my TNT HR5 to a rim drive. My problem was with pitch variations. I ended up replacing the air bladder feet with large brass cones and setting the rim drive pod on a sorbathane/acrylic bed and steel cones. This has made a vast improvement but requires some intermitent tweaking to keep the pitch steady. When it's on - the rim drive totally beats the belt. I'm in Central Jersey if you ever want to compare notes.

Andy
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