2. analog
  3. 1238291589

Tables That Feature Bearing Friction

I recently had the opportunity to audition the DPS turntable which, unlike most tables, has a certain amount of friction designed into the bearing. This, when paired with a high quality/high torque motor, is said to allow for greater speed stability--sort of like shifting to a lower gear when driving down a steep hill and allowing the engine to provide some breaking effect and thus greater vehicular stability. I am intrigued by this idea and was wondering what other people thought about this design approach. Are there other tables which use this bearing principal? One concern I have is that by introducing friction you may also be introducing noise. Comments?
dodgealum
rauliruegas
13,125 posts
 
Dertonarm:I knw that is more easy in this way because you don't have the precise-scientific information/tests on the " neutral " build materials that are very important part on any TT build/design. Yes I know your answer: futile.

Regards and enjoy the music.
dertonarm
1,042 posts
 
Indeed Berlinta, you did not get a direct response.
You did not ask for it either.
I layed out all the points the days before. I could again answer to all the points in your last 4 posts. But I do not see any attractivity to repeat myself over and over again. All the answers were already posted in this thread before the questions came up.
It will not be to the benefit of this thread - especially not right now as it is finally back to technical discussion again - if I post direct response. Rereading some of my earlier posts will show that the answers are already there. They just got "buried" in the interim when the discussion left the original intend.
dertonarm
1,042 posts
 
I do have a file - 3" thick and 8 lbs heavy - of extensive test and data sheets to about 5 dozens different materials which at one moment or another were part of the turntable design pre-thoughts (some finally made it). However I remember that one particular poster stated yesterday:
"I don't need that you convice me, normaly I take the steps by my self to convince me about any subject that has interest on what I'm trying to achieve."
I respect that position.
rhljazz
1,255 posts
 
Air would be a poor choice for a drive mechanism since it is compressable. Hydraulic fluid on the other hand is not compressable. Driving the platter with hydraulics would be an alternative choice. A pressurized bearing could also be utilized.

I'm not a turntable expert, just a bmw tech. I believe some models of Jeep/Chrysler used hydraulic cooling fan motors powered by the P/S pump due to the fact they are quieter. Perhaps a similar system could be made for a turntable? Just throwing out ideas.
dertonarm
1,042 posts
 
Dear Rhljazz, a fascinating idea. This is something really worth discussing. You happen to have any links to technical exploration and the required periphery?
More to discover