Comment by dhosek
9 hours ago
From what I know about record manufacturing, creating the lacquer master would involve adjusting the angle of the groove to allow for two concentric grooves to be laid, along with some care in creating that master. But once it’s done, the manufacturing process is handled through a stamping process (so a vinyl record isn’t cut, it’s pressed with a metal die that’s created from the lacquer master through electroplating).
A Porky prime cut.
You’d cut it normal equipment, with very wide groove spacing. Start the two grooves 180 degrees out of phase. They’ll never intersect.
You could do it with more than two grooves, just to having them at 360/n degrees apart. You’ll just have to make the groove spacing wider as the number of tracks go off. Of course that comes at the cost of playback tine.
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