On 6/29/2016 12:15 PM, Steven Smolian wrote: > Hi, Richard, > > There is a new 3D process that, apparently, creates a mold into which a liquid is poured and then hardens. Does this process sound familiar? > Hi, Steve, It does not sound familiar. I'm not certain I would call making a mold "new" but perhaps there is a new way of doing it? One of the items in that article I linked to was cost...and effort level. It sounds to me that those two factors plus resolution would be at issue. At a 9-inch diameter, the stylus on a 78 r/m disc is moving at 21.7 in/s. So a 10 kHz signal's wavelength would be about 2.2 mils (thousandths of an inch). Does this mold cutting apparatus have that kind of resolution -- into the sub-mil range? Since this is analog, I would think we'd need perhaps a resolution on the order 10x the wavelength -- I don't think the Shannon-Nyquist limit applies to this, but even if it does, we're talking still 1 mil or better resolution. Cheers, Richard -- Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada 647 479 2800 http://www.richardhess.com/tape/contact.htm Quality tape transfers -- even from hard-to-play tapes.