Brass, slate and underneath some hidden lead. A few days back I posted a picture where you could see the slots I machined into the basic aluminium piece of the turntable. These will be filled with this mixture and epoxy. 70% slate 10% brass 10% lead in 10% epoxy. It then looks like this:
Metal has a "ring" to it. Which is bad. Filled with this goo the ring is gone. I took the idea from swiss machine tool manufacturer Studer who invented their trademark GRANITAN in the seventies to substitute cast iron as the material of choice for machine bases. For detail why and all that check wikipedia and the Studer site. As the name implies the mighty GRANITAN is composed of granite and epoxy. As slate is highly regarded in hifi for base plates I used it instead of granite. No deeper thoughts or calculations are behind this, just the feeling it won't be totally wrong.
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