Vibration isolator ? Yes or No.

[woodchucker]

I am about to remount a motor on my Clausing 8520 , I am adding a 3ph motor with a vfd, going from 3/4hp to 2hp. Right now I have bicycle tubes cut up for vibration isolation. I don't know if they do anything. I am considering ordering some real isolators from McMaster. I have neoprene I could use, but like the type like these (top ones) https://www.mcmaster.com/products/v...ibration-damping-mounts-with-unthreaded-hole/.
I have 2 full sets right now, but not the 4, and these are big. I would think a proper installation would be 4, one on the head of the bolt, one between the backplate and the motor plate, one between the motor plate and the nut, with washers under the bolt head and nut.

What do you think? Am I killing it with too much isolation? Just go minimal with neoprene between backplate and motor plate... ?????

 

[extropic]

I wouldn't recommend any vibration isolation for the motor in a V belt drive system. Your mill is a V belt drive system ,right?

My reasoning is that I would rather eliminate the source of the vibration and not build in uncontrolled pully alignment and C-C distance between the pullies.
Is something bent or eccentric? Is everything balanced? I wouldn't want the tension on drive belts determining the C-C distance and alignment of the pullies.

 

[woodchucker]

So originally the Clausing had vibration isolators. I just don't have them. My vibration is from my belts (if any). They are toothed belts to be more flexible, and they sing like crazy. I figured they are probably making micro vibrations.

 

[rodm1]

I would give them a shot it's not that much work to reverse if needed it may make it more pleasurable to use.

 

[Charles scozzari]

Hi, I use this style and they work well for me. The studs are 5/16" 18 x 5/8". I sometimes need longer studs so I use a coupler. If the motor is a horizontal mount they work great. I do use them in vertical situations, but they will sag some with the load of larger motors. Maybe these could work for you. Thank's for looking.

 

[JPMacG]

I installed vibration isolators on the motor of my atlas lathe. They were from McMaster and look just like the ones that Charles has in his photo. They do eliminate high-frequency vibrations from the motor. Single phase motors produce torque pulses, which I could feel on the lathe bed. A better solution might have been for me to install a 3-phase motor, but that is more complicated and expensive.

 

[Charles scozzari]

I installed vibration isolators on the motor of my atlas lathe. They were from McMaster and look just like the ones that Charles has in his photo. They do eliminate high-frequency vibrations from the motor. Single phase motors produce torque pulses, which I could feel on the lathe bed. A better solution might have been for me to install a 3-phase motor, but that is more complicated and expensive.

I agree with pulsing, my lathe is 220v. and pulsing is present, but I strongly feel it is from the gear train. If I ever get another lathe it will have a belt driven spindle. But what if you do have a 3 phase driven lathe and are using a rotary phase converter, is pulsing felt or showing up in the work . Thanks, Charlie.

 

[rodm1]

Hockey puck pads may help someday I will give it a try.

 

[rabler]

I’m not familiar with the Clausing configuration. Is there a chance of the motor mount flexing independently from the driven pulley thereby causing vibration? Otherwise you may actually be decreasing rigidity and adding something that can vibrate (imagine chatter causing some initial vibration). The v-belt itself can absorb a small amount. More I’d want to identify the source, pulley balance being my first suspect.

Editted to add : just saw your belt post

 

[Charles scozzari]

Maybe some have heard this, but I was told the new style Link ( twist ) belts absorb/lesson vibration from from an electric motor to what ever. Not the ones from H/F, the high end brands.