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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 2 responses by maczurak

maczurak
28 posts
 
Krell303,

My belt must have an even diameter as I really don't have any wobble issues once it is seated using the above method.

Stringreen,

When I received the single motor flywheel rim drive, I had already replaced the VPI feet and plinth so this issue was new to me.

When I have some free time, I will have another go at the rim drive belt noise.

Just thought of this. I have the Super Platter and the rim drive contacts the stainless steel. I will try changing the height of the rim drive so it contacts the acrylic instead as see if this eliminates the noise.
maczurak
28 posts
 
I had updated my plinth feet to TT Weights brass Soundpoints before adding a single motor rim drive flywheel so never heard of this issue before.

In order to help seat your belt in the flywheel track, place a round toothpick or other small diameter object (small drinking straw etc.) between the flywheel grove and belt. Run this around the flywheel circumference a few times. Make sure you keep the belt even to the grove as you navigate around the circumference. You should be able to seat the belt evenly in the grove. I use a small diameter wooden cylinder I borrowed from the kids.

I also see you have the brownish rim belt for the flywheel. Does your flywheel make any noise when it touches the platter? Regardless of the contact pressure, my flywheel makes a high pitched noise. I have tried a few things to reduce/remove the noise but cannot eliminate it.
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