Direct drive vs belt vs rim vs idler arm

Hello Mr dovir I see you seem to not read my postings...again for the record that movement was because this particular TT has a hung suspension and when you put lateral side force thats what happens the platter moves...LOL

no other turntable has ever been able to accomplish this task..Does it really matter?! maybe ..maybe not..but it clearly shows that constant change of load(big load) does not affect its speed stability...IMO this is a big deal if you like to play lots of different music(frequency extremes) like including organ music etc...

Lawrence
Fidelity Forward

01-04-13: Richardkrebs
Dover
Yes we are measuring an error and correcting it before it gets worse.
This is the old argument about feedback correcting an error that has already passed. The nature of this feedback and the torque/ platter moment are critical here. The motor must totally dominate the platters rotation.

Mosin
Okay, let's go further. Do you think a special merry-go-round could be built for the little girl, so she could spin as many kids around as you can?
This goes to torque, and how one might approach building a turntable with a low torque motor, yet having mass applied so that performance would equal a turntable with a high torque motor.
I suppose the point here is that there are quite a few ways to skin the proverbial cat.

Hi Richardkrebs/Mosin

Interesting thoughts. Based on the tables I own.

Richardkrebs – I agree with your thoughts as they would apply for DD and Idler but not for string drive. I would also revise the wording to read motor/controller instead of just motor - to be explicit.

Mosin – I support and agree totally with the concept you have described. In fact based on my direct experience I believe the Verdier Platine original design when properly set up, satisfies your conditions. Are you familiar with it?

Lharasim -
I did read your response and had another look at the video. The "lurching" or "hunting" that I see occurs in the 1st 19 seconds before you put your finger on the platter. Did you have another finger on the platter out of sight ? From the lurching and hunting could I guess the deck might be an old Technics DD - maybe an SL1200 or early SP10 ?

Ct0517 and all,

Yes, I am familiar with Verdier's work, and admire I it. I am puzzled that his bearing doesn't seem to be in keeping with his papers, but I suppose that is a topic for another thread, not that I would say anything critical about Verdier because he did think outside the box. Verdier, Mitchell Cotter and others have written at length regarding the practical application physics in audio. If anyone thinks we are fumbling around in the dark now, I cannot imagine how it would be without men like them to at least challenge us to reach higher.

Ct0517
You are quite right, I should have said "Motor/Controller"
Many thanks