Do 45 RPM records need higher anti-skate setting?

Omsed: I am hoping that you do not become disenchanted with the students in the front of the room who are poking you during your teachings. I am the quiet student in the back who is soaking up as much as I can from you. Keep it up as long as you can bear it.

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,

Rtilden, you surmised correctly that I did not want to respond, it's not worth it. I have graded students that have been sure they have been right until I drew a free body diagram showing all the forces balance, in front of them, and verbally went through it. Then in real time when they offer up their view, I can in real time show the mistakes. This is not feasible in a thread on a forum where you cannot include drawings such as a free body diagram with a vector analysis.

I also realize that I was wrong in thinking everyone wants to learn. Some would just as soon remain ignorant, as long as they can convince some others they are right.

Thanks for your note!

So, over and out for me. Thanks much for your note though.

I have a device which can show the actual side-forces imposed on the cantilever. Although the instantaneous side-forces are affected by groove drag (and therefore groove modulation), it appears to me that the general side-forces experienced by the cantilever follow the tracking distortion curve.

hth

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.

I have quite a few 45s that are obviously cut at higher levels. IOW, they play louder. Also, when we cut at 45 on our lathe (I run an LP mastering operation, FWIW) we find that we can cut certain frequencies at higher levels easier than 33. I think where you are having a problem is the assumption that the 'mastering guys' are going for the 'same volume'. We might and we might not. Usually we cut with two goals:

1) see if we can get it all on the side and
2) don't over cut such that the stylus gets knocked out of the groove or the cut goes over the previous adjacent groove.

Its pretty well impossible to overload the cutter system- the main limit is cutting a groove that a cartridge can track without distortion. A lot depends on the signal that is being recorded and they are not all the same else the planet would be a boring place :)

So if friction due to modulation is indeed a factor in skating forces, it would be a mistake to assume that it will be a constant- IOW it is indeed a variable.