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Post by ChrisB on Oct 6, 2015 7:32:22 GMT
I think I know what's going on here and I don't think all is as it seems at first.
Do we have any Russian speakers on the forum? (I think it is Russian).
Has anyone got any thoughts as to what is going on?
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Post by MartinT on Oct 6, 2015 7:45:31 GMT
Some sort of fluid self-centering and damping. I'm not sure why and the wow would be horrific when the arm is swinging backwards and forwards like that!
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ynwan
Rank: Trio
Posts: 185 
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Post by ynwan on Oct 6, 2015 7:48:50 GMT
It looks to me as if it is an attempt to show the effect of dynamic drag but instead of influencing the speed of the platter it is the arm that is displaced.
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Post by MartinT on Oct 6, 2015 7:54:36 GMT
It looks to me as if it is an attempt to show the effect of dynamic drag Yes, it illustrates that very well. |
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Post by ChrisB on Oct 6, 2015 8:03:29 GMT
I don't think it's an actual tonearm for the purpose of listening o music Martin. I also think it's more about pivoted arms than parallel tracking ones.
There's a paper scale measuring the deflection of the string above the glass, so yes, they seem to be measuring the drag (or force on the tangent) and it's interesting how it varies.
I think the actual purpose is something to do with skating/anti-skating.
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Post by ChrisB on Oct 6, 2015 8:15:00 GMT
Because of the differing radii of the groove, the groove speed relative to the stylus varies massively across the record and therefore, so will the tangential forces. (The information in the groove will also have an additional effect) If the headshell has an offset, the arm will require an anti-skating adjustment but because the tangential speed varies, the ideal anti-skating force is going to vary. I think they are trying to measure what's required at different points across the record in order to find an ideal value.
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