Do 45 RPM records need higher anti-skate setting?

Simple answer: No ;-)

I am with Doak in that skating force originates due to friction between the stylus tip and the groove. That friction force is a constant with respect to velocity (but not constant with respect to much else). Nevertheless, the only difference between a 45 and a 33 would be groove modulation. Now I think of it, 45s may be cut differently; the music has more "room" so the groove walls may be less tortuous. Ergo, in certain cases and for certain musical moments, I could imagine there could be less skating force generated by 45s than by 33s, but only for that reason. For example, this might apply if you listen to exactly the same musical piece on a 45 vs on a 33. You found that an increase in anti-skate cured your problem, which would not be consistent with my ruminations.

All of that aside, and assuming the 45 is made from the same vinyl as a comparable 33 (so that friction force is comparable), then skating force should be about the same.

Skating force is the radial component of stylus friction. The stylus friction vector is tangential and can be resolved into orthonogal components, one running through the tonearm pivot and one running radially. The value is sintheta x stylus friction where theta is headshell angle.

One of the tenets of sliding/dynamic friction is that it is nearly totally independent of sliding speed. So friction is nearly equal whether at 45 or 33. Therefore no change needed.

Skating force has nothing to do with "centrifugal force" or momentum, or anything else other than the radial component of stylus friction. I've read many reviewers, manufacturers, and end users theorizing that some centrifugal force is at work, which is a totally different thing and has nothing to do with a tonearm tracking a record. Course, in audio everyone seems sure of everything. Beware: when someone says "it's simple physics", my experience is that they are about to spout total nonsense!

Omsed, If you really want to get pedantic, there is no such thing as "centrifugal force". The force that keeps a body in orbit is "centripetal", or "center-seeking", meaning it has a vector directed radially toward the center (or spindle, in this case). Such a force is necessary to keep a body in orbit, because of Newton's First Law that states that a body in motion will remain in (linear) motion, unless acted upon by a force. The reason we intuit a centrifugal force, I guess, is because of Newton's Third Law. Otherwise, we agree.

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