Do 45 RPM records need higher anti-skate setting?

John, Yes, I just misunderstood the language of your first post on Alexandrovitch. I later figured out what you meant, and there is no disagreement with our earlier conclusion.

I hate to discuss the origin of the skating force, but I love it too. Such is life. My belief is that the prime cause of the skating force is friction of the stylus in the groove coupled with the fact that the cantilever is never tangent to the groove, because of "stylus overhang". "Headshell offset angle" changes the directions of the force vector that results from this. But the net effect is a force that pulls the stylus tip inward along the arc of the tonearm. (Because the tonearm is mechanically stiff and the pivot is anchored, the only way the stylus tip can respond to the forces on it is to "skate" inward on the one permitted path.) This is how I think of it, anyway.

So the idea that a 45 rpm disc cut with greater modulation to also require slightly greater anti-skate sounds like its not that far-fetched.

Atmasphere,
It would seem so.

Lewm,
I think your take on it is right. All I would say is that rather than "headshell" offset angle, it is perhaps better to think of it as "groove" offset angle (which is what gives rise to the tracking angle error, as both the cartridge offset and headshell offsets remain constant while the groove offset angle changes, the error increasing markedly at the innermost radii, giving rise to higher skating forces there).
J
.

Ralph, Yes, but wouldn't you think that a 45 rpm version of any LP would have relatively lower groove tortuosity/modulation than the comparable 33, because the music signal is allowed more "room" at 45 rpm, per unit of time. Thus, I thought the OPs story that increasing AS helped was not consistent with the notion that groove modulation affected the skating force so as to increase it on average. If anything, I would expect a decrease in skating force, on average. That was a point i made way back up the thread.

45s are NOT cut with greater modulation (if they were the sound would be louder through the speakers), the goal of the mastering guys is same volume, so the idea that different anti-skate is required is far fetched. Same anti-skate.