Hey JR -- the only problem that I see with this simulation is that "most" moving-coil cartridges [excluding REGA] have their coils "embedded in" or pulled (tightly, via the tensioning wire) "up-against" the elastomer damper (or it would provide no dampening or support) - ergo: there is no “gap” between the coils and the damper, as depicted here. So your comment that "it takes very little rotational force to shift a coil bobbin around its central axis" [re: skating-and-anti-skating-force-myths] is (to my mind) not really a feasible model -- the damper is selected to delimit the degrees of freedom that a cartridge cantilever has, and keep the coil motor in the magnetic gap. I think that “having the coil body” rotate would be something that most transducer designers would go to great lengths to avoid. Perhaps some rethinking/revisualization is needed here. Just saying ... 🙂
Hi Charles. I'm going to have to disagree with the minimization of this concern. I suppose it is a matter of agreeing on what I meant by "little rotational force". I've seen several hundred cartridges in the lab by now and I've seen this situation many times. Usually caused by stylus being dragged violently across the record surface due to an unfortunate meeting with one's hand. Of course, the system is designed to maintain the position of the coil bobbin, but that system can fail after some brute force is applied.
Hey JR -- the only problem that I see with this simulation is that "most" moving-coil cartridges [excluding REGA] have their coils "embedded in" or pulled (tightly, via the tensioning wire) "up-against" the elastomer damper (or it would provide no dampening or support) - ergo: there is no “gap” between the coils and the damper, as depicted here.
So your comment that "it takes very little rotational force to shift a coil bobbin around its central axis" [re: skating-and-anti-skating-force-myths] is (to my mind) not really a feasible model -- the damper is selected to delimit the degrees of freedom that a cartridge cantilever has, and keep the coil motor in the magnetic gap. I think that “having the coil body” rotate would be something that most transducer designers would go to great lengths to avoid. Perhaps some rethinking/revisualization is needed here. Just saying ... 🙂
Hi Charles. I'm going to have to disagree with the minimization of this concern. I suppose it is a matter of agreeing on what I meant by "little rotational force". I've seen several hundred cartridges in the lab by now and I've seen this situation many times. Usually caused by stylus being dragged violently across the record surface due to an unfortunate meeting with one's hand. Of course, the system is designed to maintain the position of the coil bobbin, but that system can fail after some brute force is applied.