Do 45 RPM records need higher anti-skate setting?

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.

Tracking angle error is negligible in the calculation of anti-skate, the magnitude of changing force being very small, tracking error only being +/- about 2 degrees even for a 9.5" tonearm. No arm's anti skate mechanism is within that range of accuracy, you can ignore that amount of change (that due to tracking error).

I have designed several arms, tested nearly any arm you can name, have dynamometers (force gauges) that can pick up the actual numbers. The theory coincides with actual measured results quite well.

We have some folks who are obviously not science people here (meaning not physicists, not engineers) "correcting" good information with misinformation. Overhang is not part of skating forces, RPM is not, 45's are not cut at a higher groove velocity (groove velocity that creates sound is vertical and horizontal movement), it is just the linear velocity past the stylus that is increased.