Calculating Compost Cylinder Drive Motor Requirements

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SUMMARY

The discussion focuses on calculating the horsepower required to rotate a steel hollow cylinder containing approximately 0.75 tons of raw compost. The cylinder has an outer diameter of 1.8 meters and a length of 2.8 meters, rotating at a speed of 3 RPM. Key considerations include the need for baffles or paddles to ensure proper mixing and the importance of accounting for resistance and friction factors in the calculations. Accurate horsepower requirements depend on these additional factors.

PREREQUISITES
  • Understanding of rotational mechanics
  • Familiarity with torque calculations
  • Knowledge of friction and resistance factors
  • Basic principles of compost mixing
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Engineers, fabricators, and anyone involved in designing or optimizing compost mixing systems will benefit from this discussion.

fabricator
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Help required in order to determine required horsepower to rotate a steel hollow cylinde containing approx. 0.75 tons raw compost. the cyl. o/d is 1.8m., length is 2.8m. The cyl. is rotated about a central axis which is a 3inch o/d steel tube supported on 2 plumber block bearings.The cyl. req.s turning slowly 3rpm. once or twice a day.
 
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Welcome to PF, Fabricator.
I can't help with any math stuff, but there is something missing from your description. Do you have "baffles" or "paddles" to ensure the mix being properly affected by the rotation? In any even, a definitive response would require some sort of resistance/friction factor.
 

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