D3D v20.04 Calculations

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Bed Weight and Lifting Capacity

Motors advertised at 84 oz in or 5.25 in lb
with 1/2 diameter pulley, that is about 20 lb driver force - about right.
Total lift is 40 lb from both sides
Weight of bed - 7.5 lb for top and bottom, 3.5 lb for sides. Rods - .7 lb per foot, we have 3 feet - 2 lb more. Insulation - maybe 1.4 lb / cu ft [1]

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