Turnable database with TimeLine

Tony, This is an example of playing a very eccentric record:
http://www.youtube.com/watch?v=H_GG65tMxOs

You see the saddle swaying to and fro smoothly due to eccentricity. If you look closely enough (sorry my stone-aged video quality, well I´m not into videos really lol) you may notice the stylus stays perfectly stationary relative to the cartridge body. So the "wow" is practically caused only by the eccentricity of the record. The music sounds still very enjoyable. In this case the Salvation direct rim motor implementation works very nicely. If we have very sophisticated analog techniques, records can sound very nice despite of platter or/and record eccentricities... and slight warps.

My point is that knowing about the specific motor is useful when making these Timeline comparisons because what you see isn't always what you actually get.

I know this is true….and I apologise to Tonywinsc if I appeared dismissive of his valuable contributions here…..but at no time was ‘cogging’ mentioned till I did so in regards to the video showing this phenomenon with the Timeline on the Micro Seiki RX-5000 string-drive turntable. This is one of the drawbacks of using string or thread drive turntables as there is no ‘filter’ to the motor’s cogging like there is with flexible rubber belt drives.
For an inflexible thread or string drive turntable to work well….the motor needs to be virtually ‘cogless’ like that of the Caliburn as Mosin has mentioned.
I understand what Tonywinsc and Mosin are saying about motors and their characteristics……and I agree that it is a highly complex subject for those without the knowledge or interest.
HERE
is a Link to Peter Moncrief’s full article which asks….and answers….more questions than you ever knew existed about turntable motors?

However……this Thread is about a Video Database of turntables with and without stylus drag as demonstrated via the Sutherland Timeline.
Syntax’s video clearly demonstrates that severe motor ‘cogging’ can be seen on the Timeline laser whilst other videos posted…..show that any cogging which may exist in other motors….is not so graphically demonstrated?
Many of us have readily admitted that correct and/or consistent speed control of a turntable…is but one ingredient to determining its performance.
Many of us also agree that it is however….the primary fundamental ingredient to get right.
Speculating on the other ‘hidden’ qualities of a particular motor….which cannot be demonstrated via the Timeline or other objective repeatable tests….should be discussed on other more suitable Threads?

We are still hopefully awaiting the promised Timeline video for Mosin’s turntable….and perhaps Dover’s Final motor which appears more sophisticated than the Micro Seiki model and might demonstrate a ‘string-drive’ turntable which doesn’t suffer from cogging or ‘stylus drag’?

Peterayer,

To be fair, I think the frame speed of his video camera is interfering with the laser flash increments. I think that is why some laser flashes are not even seen and why the dash appears to change in length. This occurs with my iPhone video as well, but to a lesser degree. I don't know the f/s spec. for the iPhone.

We are all working within the same available technologies. All my videos are taken with the iPhone and up-loaded directly to YouTube.
If you start offering excuses for the visual evidence of a particular video.....this Database will be irrelevant?

Sadly, this database has not grown to include many samples. Interestingly, it has morphed into a discussion of motor types. And has been pointed out, the Timeline only shows one characteristic of turntable speed, namely average speed. And this may be less critical than other characteristics of speed like consistency over very short time intervals.

Halcro, I'm offering one possible explanation about why the TimeLine dash appears to change in length in the Micro video, ie. f/s speed of the video camera. I don't think of it as making excuses for video evidence. If the result is truly as you describe, do you think Syntax would have posted the video for instant criticism?

Could you explain how you conclude that it is the effect of cogging from the same video evidence, especially since Syntax has explained that the effect on the dash line is different when actually observed by the naked eye?

I have taken about five videos of my turntable and the quality of the laser dash appears different in each one depending on lighting, camera angle to the laser dash, distance etc. It is clear to me that the video evidence with an iPhone is far from a perfect method and I think the Micro video was taken with a SLR still camera that also does video.

The differences between rubber belt and thread/string drive is an interesting topic. The Techdas has a hybrid belt of sorts, which I think is a rubber coated inelastic belt, so very little stretch/creep occurs.

"We are still hopefully awaiting the promised Timeline video for Mosin’s turntable…."

The trouble for most members is that they don't own a TimeLine. I do, but I don't own a camera that can video. I'm waiting for my son to retrieve his. He loaned it to a friend, and his Nikon DLSR doesn't do movies. Hopefully, it won't be too long.