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
I hear you Tony but it seems nobody else is or wants to pay attention to you. They are believing that if the timeline isn't right nor is the turntble but yet there have only been just a couple of tables mentioned that the timeline is true on.

Brad
Tony ~ I'd be happy with what you propose BUT what I see currently with the TTWeights table is that the line moves EVERY rotation which to me is just unacceptable.
What does everyone expect from their turntables when using the Timline device? Absolute zero drift of the laser mark?
It's not an impossible expectation?
Have you not seen my video of the Victor TT-101 with the Timeline and three arms being lowered and raised with "absolute zero drift"?
Sksos1. In a word, no. I do not own a TT Weights turntable. I own a tweaked Lenco in a slate plinth, a Denon DP80 in a slate plinth, a Technics SP10 Mk3 in a slate and wood plinth, and a Kenwood L07D. I should sell two of them, but I cannot pick which ones. They each seem irreplaceable. About 4 years ago, I went from a very good belt-drive tt ($5000 class) to the Lenco and then to direct-drive, and I have no second thoughts. But I do confess that vintage tt's appeal to the collector instinct in me.

Since others here have also indicated that their turntables of many various types have "failed" the Timeline test, perhaps it is unwise or unfair to keep harping on the one brand that you found to be faulty by that sole criterion.
Should have read Tony's post before writing the above post. I think the amount of error and the type of error Tony describes should be perfectly acceptable. It is a linear error; in other words it would be the result of the platter spinning a teeny bit too fast at some constant rate. That kind of error should be adjustable back to dead on accurate, and if it's not, it nevertheless would be inconsequential. I thought we all agreed that the concern is for transient or instantaneous errors related to variations in stylus drag. Such errors would in theory go either way, too fast or too slow. So the Timeline light might move back and forth in either direction from neutral.