Turntable speed accuracy

Lewm,
Have been reading this for awhile and want to ask a question while throwing in another variable.
The SME, I have the SME 10, is set for Sumiko Celebration, which I have, other turntables use other stylus makers or Sumiko for their voicing.
Has any one tried to see if the degree or speed that the turntable is off is neutralized when the stylus is lowered and its drag can be added to the equation? IOW is the difference from perfect speed via the timeline cancelled once the arm/stylus is lowered and music is playing?

Dear Uru, I am not the font of all knowledge on this subject, hardly. But what you suggest does seem logical; the speed of a tt may deliberately be set to slightly fast with no load, so that it then achieves perfect speed with the load of stylus drag. But in principle, I would prefer a motor or drive system that is robust enough to maintain proper speed under all conditions, because the load of stylus drag is varying all the time due to the groove modulations and also in relation to the distance of the stylus tip from the spindle. It would therefore be impossible to know in advance and for all LPs "how fast" is fast enough to result in correct speed in the presence of stylus drag. So, IMO, this is where torque, the compliance of the drive system, the speed corrective capacity of the drive electronics, etc, come into play.

Thanks, Dev. I was just joking, but your post does move me closer to getting a timeline just to satisfy my curiosity.

And when I'm unhappy with the results (I pessimistically predict), I'll wish I had Lewm's skills or at least easy access to someone with similar skills.

Lewm, The Artemis is an interesting design. I have not heard one yet.

I had hum caused by the motor on a VPI Classic and a LP12. The Classic's motor is on the front left. Maybe if the motor was placed in the rear it would have been better. The LP12 had the motor and power supply under the platter. Could be if I had an outboard PS like a Lingo it would solve the hum. I was not using a Grado. I am sure there are TT designs that have the motor close that don't have hum issues. Just a matter of being well designed.

I have a SP10 mk2a now and experience no hum with the same carts. Sorry if all of this is off the topic of this thread.

Sarcher30: "Unfortunately bringing the motor closer to the platter also brings it closer to the cartridge as well. Which on the TT's I have had with that arrangement caused hum on most of my cartrides. There may be some TT's that sheild the motor well enough to pull it off."

Perhaps you can try grounding the motor housing?

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