Turnable database with TimeLine

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.

Make that DSLR. LOL

It gets better. I just found out that the video camera is a tape unit.

A promise is a promise, however.

Hi Harold,
Cool video. Very cool turntable and tonearm. I watched the video on my iPad and I could hear the WOW. I was supposed to be able to hear it, right? I think it was most pronounced when the stylus tracked over the wave in the record rather than the eccentric motion of the record; but hearing it in person would certainly be better. I think we all own a few records like that, unfortunately. Ironically, my test record is one that has an off center hole. So when I play the pure test tones, the WOW is very evident. The WOW caused by eccentric records is not so obvious to me when playing music- as long as the record is not too bad.

And thank you Halcro for that link. Much of what he wrote I already understood; but he gave me some insight into my Sota turntable. I can see his point about how the horizontal axis being unconstrained is a bad thing on a floating sub chassis. I can see how variations in stylus drag will change the belt load/tension which will cause the sub chassis to move in the horizontal direction. That movement, no matter how slight will alter the belt tension some more. Any change in belt tension will affect platter speed. It gave me some ideas. First, I'm going to fix the sub chassis with some rubber shims and see if I can hear a difference in the rhythm and pace. If I can, then I have an idea how I might constrain the horizontal axis without fixing the vertical axis.