Vinyl Asylum

Posted by JonM (A) on January 16, 2025 at 13:15:38

In Reply to: RE: Skating force is produced by the groove, so that test is not valid; see here: posted by Steve Parry on January 16, 2025 at 08:19:30

The AI Overview is incorrect. There is no centrifugal force*, least of all from the spinning grooves. John Elison's vector diagram is correct.

(One thing John's diagram doesn't show is the deflection of the stylus cantilever due to the inward pull of the skating force. So skating force not only places more force on the inner groove wall, it can also move the magnet out of a symmetrical location relative to the cartridge's coils. My diagram isn't as precise as his, but I try to show how that deflection can arise.)

(*Strictly speaking, there is no such thing as "centrifugal" force. With an object revolving around a point, there is only a centripetal force pulling the object toward the center. Imagine a ball revolving around a pivot and you release the string - there is suddenly no centripetal force, and the ball will fly away (in a line tangential to its former circular path) due to its own momentum. An object in motion tends to stay in motion, in a straight line, unless acted upon by an external force, like centripetal force from a string. And this has nothing to do with a stylus in a groove :-)