VPI 2nd Pivot for 3D

"If I remember the latest information about was by Dr. A:J Van denHul who measured 160° celcius between the stylus tip and groove"

This is another "funny fact" from Raul that is like his claim that VTF is "infinite" because the contact area of a stylus is "infinitely small" it sure must be a funny world Raul lives in with these "theories" that are "fantasies" that he insists are "facts." Such confusion about such basic things really makes me wonder whether Raul is aware of this confusion he loves to share as "facts" or whether Raul's problems are really much deeper than that in which case we should be feeling very sorry for Raul!

Dear Raul,
Perhaps the moderator should step in at this point...  ;)

Yes, I've only heard the SAT tone arm via 320kbps needle drops versus CDs etc but it presents a persuasive argument even if unattainable for the many. If there are hidden distortions in there I like them! ;) :)

BTW before I took early retirement, our thermal engineers constantly used thermal imaging cameras to analyse circuit boards and develop thermal maps. It's probably what VDH used to get an approximation of the stylus interface? They could be quite handy for troubleshooting too.

I recall an EMI chemist commenting on one forum that the melting point of some vinyl formulations was as low as 112C (I know, a bit nerve wracking for the steam cleaning brigade;)
Best regards,
Bill

Dear @dodgealum : This video is from the Levinson tonearm and I hope that what we see between the the second 10 and the 16 second is not what happens with that fixed bearing tonearm manufactured by VPI:

https://www.youtube.com/watch?v=iTTLM9gPU9o

Anyway, the video is a very good fact that confirm what that those huge forces makes with the cartridge/tonearm and why unipivots are out of question.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

Dear @moonglum :  Handbook for enginners: "  "It has been experimentally shown that with such high pressures and forces of friction between stylus and the vinyl, that the outer skin layer of the record material melts as the tip slides over the plastic and then refreezes almost as fast as it melted. It has been suggested that since the melting temperature of vinyl is about 480 °F (248 °C) that the same temperature exists in the contact area.”

You can confirm here the fact you was thinking about and at the same time other additional fact that confirms about those very huge forces generated down there. 

Btw, I can tell you that my very high ignorance levels brought me to a extreme high frustration levels.  Never mind, such is life.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

@moonglum : "  Van Den Hul states :

"But the most important thing is record wear. I measured temperatures using a thermistor with a thin wire around the tip. A conical tip went up to about 140 deg C, but my one was 60 deg. I would like to come down further, but this was the lowest possible value."

R.