Another “How vinyl records are made” podcast

[Moomintroll]

https://audio-head.com/vinyl-transparency-how-records-are-made/
This one concentrates on how the lacquers are cut and discs pressed. I actually found it interesting, so thought I’d share it. I especially loved the claim around 16:50 in, where it is claimed that the record rotates more slowly nearer the groove, “something like 18rpm” I think he says. LOL. This guy is a “mastering engineer” but constant angular velocity seems to have escaped him. I did wonder if he was confusing it with CD, which rotates faster nearer the centre - constant linear velocity.

He does sum up the whole process around 28 minutes in, “it’s a wonder it works at all”

Absolutely.

’troll

 

[Baba Yaga]

Well, the record rotates at the same speed but I guess what he tried to say is that the relative speed of the stylus vs. the record will decrease when the arm moves toward the center as the diameter of the spiral is decreasing while the time for a rotation stays the same.
I assume ‚tangential velocity is decreasing’ would be the proper term.