On Sunday, October 30, 2016 at 9:03:03 AM UTC-4, wrote:
Please note the interpolations:
To talk about stylus pressure against the vinyl groove one must also consider effective mass of the stylus + cantilever etc. combined with acceleration of that moving mass, F = MA.
True, but keep in mind that for the stylus to do its job - which is to transmit the vibration from the groove to the magnet (or coil) to the fixed coil in the cartridge, it must be fairly rigid (at least horizontally). As I understand it, there is considerable low-frequency vertical damping to account for warped records, but horizontal damping is minimal.
Re. tires, the manufacturers of high performance summer tires typically warn not to use them below ~40F. The problem is not traction related, the rubber compound becomes brittle and prone to cracking. Also, one cannot count on friction warming the treads if the vehicle is driven at low speeds. This link talks about using and storing HPSTs:
http://www.tirerack.com/tires/tirete...jsp?techid=220
All true. But, HP tires are a different class from the common herd. However and furthermore, tires age out in 3-5 (with some few lasting as long as 10 in low ozone areas) years - another very seldom understood issue, especially with Great Aunt Esmeralda, who drives only to church, Bingo, and the market - her tires will be 'done' long before they are 'done'.
Peter Wieck
Melrose Park, PA