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Engineering
Mechanical Engineering
Need Help Calculating what Motor and Gearbox I need (building myself a Trommel)
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[QUOTE="Baluncore, post: 5756942, member: 447632"] On a 50 Hz supply, a low cost induction motor runs at just below 1500 RPM. 1500/20 = 75 reduction ratio. At 60 Hz it will be just below 1800 RPM. 1800/25 needs a 72 ratio. Drum diameter is 30” so motor pulley would need to be about 30”/73 = 0.4” which is impossibly small. So you will need another stage of reduction. If the motor pulley used was 3” diameter the extra reduction stage would need to be about 3”/0.4” = 7.3 which could be done with a gearbox or an intermediate shaft and an extra belt. The compost is being continuously lifted up as the drum rotates, then falls back. The mass of compost rolling in the trommel and the hight it falls from will determine the HP required. [/QUOTE]
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Forums
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Mechanical Engineering
Need Help Calculating what Motor and Gearbox I need (building myself a Trommel)
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