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R4
A simple non-suspended plinth using TD150 or TD160 drive parts. Plinth materials are 5 layers of aluminum plate, 4 layers of pvc plate laminated with polyurethane adhesive into a constrained layer build-up.
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Photo #1: Perspective View. Table less tonearm.
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Photo #2: Side View.
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photo #3: Front View. Footers are BDR cones with 1/2 inch aluminum spacers threaded into the bottom of the plinth with 1/4-20 studs.
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Photo #5: Speed change from 33-1/3 to 45 rpm is by hand. Outer platter is lifted off, exposing the inner platter, belt and motor pulley. The belt is derailed from one pulley crown to the other, changing speeds. Power switching will be located to an external power supply.
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Photo #7: The motor plate mounts on the top surface layer. The platter bearing mounts into lower layers.
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photo #8: Armboard mounting detail. Materials for the armboard are completely optional. A wood grained shader was used in this case. Various hardwoods may be tried. Also, composite thermoplastics like carbon fiber and phenolic may be put to use. The armboard in this illustration is cut to fit an SME 3009 S2 improved tonearm.
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