New W&F Analyzer + Polar Plots

[Sleiven]

Not surprised I have 21F and 51F. Too bad the tone arms are not as good.. flimsy and with obvious resonances, at least mine,,when I compare with my SME V.

 

[Sleiven]

Too much work…

It will not be correct anyway… never got theory to match reality here. Stretch and pull and shrink and slip mess up the too simple theory..

 

[JP]

Because you can't use "simple" theory, and we're not applying the models in a predictive manner. My existing calculator isn't to predict problems, it's to provide a quick reference for the nature of frequency components. The real question is what inputs are required for reasonable results, and if those are easily obtained.

 

[Thomas_AA]

It is probably doable, but there are many variables. Just had an AI chat about creep and belt walking on convex pulleys.

"Belt walking happens because of a combination of:

• crowned pulley geometry
• tiny alignment errors
• elastic creep
• surface friction variations
• belt thickness irregularities

When Belt Walking Becomes a Problem​

It can indicate an issue if:

• the belt climbs off the pulley
• it moves rapidly
• it always drifts to one edge

Possible causes:

• worn belt
• pulley contamination
• misaligned motor mount
• belt too tight"

 

[Sleiven]

Belt /motor problems can be quite visible as noise peaks between 100 and 200hz in a 1000hz or 3000hz plot, I see difference in the spectrum depending on belt conditions and or type. Spinning platter without belt can be revealing. Visually if the belt looks blurry I know it is vibrating too much and time for some talcum

Belt Passing Frequency Vibration Calculator

Belt Vibration Calculator finds the Belt-Passing Frequency of worn out Belt-Driven Machines.

www.ritec-eg.com

I do not understand what I did not think of this belt rest before…good belts are hard to get

Vibration Library & Tools

Vibration Analysis Case Studies - Bearing Frequency Calculator - Demos & Simulation - Vibration Calculator - Belt Frequency Calculator - FFT Simulation - Interactive Vibration - Vibration Simulation

www.ritec-eg.com

 

[Thomas_AA]

The varying type of belt and pulley is another complication. @Sleiven , your belt looks as if it has both lower and higher frequency vibration.

 

[Sleiven]

well with proper alignment and care of belt the issues can be solved, Like this (not flat due to bass RIAA EQ)

 

[flavio81]

Thanks guys you made me reminder why I don't like belt drive turntables, and now I'm considering to sell the last belt drive I own, a Pioneer PL-41A.

Damn stretchy, bouncy, resonant, non-uniform, twitchy, flimsy belts!

 

[Thomas_AA]

Thanks guys you made me reminder why I don't like belt drive turntables, and now I'm considering to sell the last belt drive I own, a Pioneer PL-41A.

Damn stretchy, bouncy, resonant, non-uniform, twitchy, flimsy belts!

Have you checked how it performs? Although test records seems to be all over the place, it does not hurt to test one or two with a W&F track. E.g. the AP test record.

 

[Thomas_AA]

The Linn Thakker belt showed to be quite a disappointment. The original Linn neoprene belt seems to be the only alternative...

The W&F Analyzer Project, Uberrimus

There is unfortunately, that I know of, not a better replacement belt for the Linn Axis (or LP12). I had hopes for the Thakker belt but the 0.5 and particularly the 1.0 Hz component increased significantly. I also think the Thakker belt was slightly longer than the Linn Belt. Values below are...

www.audiosciencereview.com