VPI table isolation

What really took my rig up a notch was separating the motor assembly from the platter/plinth. I built a special rack that accepted the feet with a completely separate (to the floor)assembly holding the motor. The only problem I had was occasionally I would have to readjust the "system" in so that the motor was in the right position (I think it was from slowly nudging it while using the on/off switch). FWIW, I am amazed there isn't a commercially available rack for this situation. I own a custom furniture fabrication shop and have debated on offering one myself.

Thanks alot guys. These are very helpful recommendations. I will play with positioning tonight and look at adding an isolation tweak.

I am debating an upgrade to my table, and have been hesitant because my system sounds quite good and I'm not convinced that I have my current setup optimised. Feeling that much vibration on the armtube while the motor is running was quite shocking. Eliminating that, and adding the sds I just ordered should give me a nice leap forward.

Thanks again.

Bob

Good move on the SDS. I'm sure you'll get the vibration resolved. Let us know.

VPI at one point recommended putting a mouse pad under the motor, you can put softer rubber feet under the motor to reduce vibration being transmitted to the rack and back to your table. ideally you want to absorb all vibration from the motor and that will take more than one type of material, you can stack maple, rubber, aluminum, sand, etc to more effectively reduce vibration transfer.

There is so much B.S. talked about isolation that we seem to ignore common sense. All motors vibrate,the vibration is transmitted to what they sit on and in turn to what sits on that. Put 3 or 4 vibrapods under the motor,cost $20-$25.I GUARANTEE this will fix the problem.The mouse pad works really well too.
I bought a stethescope to help me figure out what really works on vibrations. While I do use some cones(mainly BDR)they do very little to stop the transmission of vibrations. What they tend to do is change the resonance of that vibration with small audble results (sometimes)
My experience using the stethescope has been that only pliant things such as rubber, air filled bags, springs, gells etc stop or reduce the tansmission of vibrations. This is born out in the really world also were thesetypes or materials are used on electron microscopes and pumps and motors etc. You don't see microscopes on Stillpoints