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Turntable speed accuracy

There is another thread (about the NVS table) which has a subordinate discussion about turntable speed accuracy and different methods of checking. Some suggest using the Timeline laser, others use a strobe disk.

I assume everyone agrees that speed accuracy is of utmost importance. What is the best way to verify results? What is the most speed-accurate drive method? And is speed accuracy really the most important consideration for proper turntable design or are there some compromises with certain drive types that make others still viable?
peterayer
ct0517's avatar
ct0517
2,041 posts
 
Hi Lew - regarding the Lenco l75. Can you please do the testing with and without the Walker motor controller. I realize setting the motor speed with the original slider is a bit of a pain. Am very interested in your impressions findings between the two.
Cheers
ct0517's avatar
ct0517
2,041 posts
 
Hi Henry
I just re-read what you wrote. I am assuming when you say

“ In this.....a belt or thread drive is at a severe disadvantage”

that this is your opinion only.

Have you heard a string drive TT that was designed by its manufacturer for the use of string ?

Cheers Chris
lewm
13,309 posts
 
Actually, since the Timeline is sitting on the spindle, and cannot fit completely over the spindle on a Lenco, which has a "fat"spindle, slippage of the LP would have no direct effect on the Timeline, in my particular report above. The Timeline is nowhere near to contacting the actual LP surface; it is kind of perched about 1 cm above it, which is as far down as it can go on the Lenco spindle.

Ct, Please say why you think there is anything of value to be learned by running without the Walker MC. I don't see the point, once I were to re-set the speed using the idler wheel adjustment. The Walker has no feedback mechanism; it only regenerates the AC used by the motor and controls motor speed by altering voltage. If anything, the WMC may reduce the torque of the single phase induction motor of the Lenco, because for this type of motor, voltage and torque are interdependent, within a limited range of adjustment.
ct0517's avatar
ct0517
2,041 posts
 
Hi Lew - do u have a center weight with a flat top ? Bit of blue tac on the bottom of the Timeline and place it on top of it maybe? Yes that Lenco has a really fat spindle.

I am not familiar with the WMC - thanx for explanation. I have experimented with my SDS and my Lenco in the past - reason for my post. thx
halcro's avatar
halcro
2,664 posts
 
Hi Chris,
My statement was directed at the 'speed' of any correction performed by the motor controller being felt by the platter?
I don't think there is any doubt that in a DD situation with the platter being attached to the motor......any speed correction will be effected faster than via a belt or thread connected to a motor/s at some distance from the platter?
If you re-read Peter Moncrief's excellent article that I posted several times........he provides a great deal of information regarding this very subject.

I'm not sure what the differences might be in a turntable designed for a string/thread drive over a belt?
Can you or someone provide some further thoughts on this subject?
Regards
Henry
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