Do 45 RPM records need higher anti-skate setting?

"(Even) if dynamic friction magnitude were dependent upon velocity. Fact is dynamic friction is nearly independent upon velocity."

A pivoted arm with overhang will seek the center of a blank (ungroved) LP. Would it not move towards the spindle more rapidly if the disc were spun at 78 or 45 rpm than at 33.3?

Peace,

Regards, Omsed: Let's clarify the difference between centrifugal and centripetal force. Centripetal force is ANY force that acts to prevent an object from moving away from the center of an orbit, see http://www.diffen.com/difference/Centrifugal_Force_vs_Centripetal_Force.

Consider skating phenomena the consequence of two forces acting upon the TA. First, friction along the axis of the TA. This is relative to grove modulation or any stylus "drag" in an unmodulated groove, or even an un-grooved disc.

Any TA (with under or overhang) will be subject to a second vector, this is tangent to the long axis of the TA, and, dependent on wether the stylus is under or overhung relative to the spindle, will exert a lateral force on the stylus. The TA will be inclined to move either away (underhung), or towards (overhang) the center of revolution. The groove constrains the TA movement and serves as a centripetal force.

These actions are observable and repeatable, the same principles that guided Sir Isaac, who also gave definition to centripetal force.

The question remains unanswered, would not a TA tend towards the center of an un-grooved disc more rapidly if spun at 45rpm rather than at 33.3rpm?

Peace,

Regards, John Gordan: As always, a pleasure to have your informed opinion. I do need to correct my first para., most recent post. Centripetal force *opposes* centrifugal force, to what degree is a variable.

Peace,

Hmm. So I used a pencil & fixed a plastic headed straight pin at each end. Let's call the "pivot" proximal, the other, the unconstrained end, "distal". Held the "pivot" pin and placed the other on a Boston Audio Mat2, the plastic pin heads depending from the beam. In a condition described as "overhang", the pencil "beam" was center seeking. As OH was diminished speed of travel also diminished. In a condition of "underhang", the end distal from the crude "pivot" came to rest further from the center of rotation, a state of "equilibrium" was observed. As "underhang" was increased, the distal end eventually ran entirely off the edge of the Mat2.

Running the "pivot" against a straight edge, it seemed to me that the beam remained parallel to its previous location and also seemed to maintain a 90* angle to the guiding straight edge. Movement at point "A" resulted in an equivalent movement at "B" in a most linear fashion.

It also appears these various movements occupied a smaller time-frame as speed of rotation was increased.

'Fraid I lack the background in Physics to prove these actions.

Peace,