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• # Gearing up

Discussion in 'Calculations' started by catcity, Dec 4, 2018.

1. ### catcityNew Member

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I can deliver 6700ft/lb to a 600mmdia drive wheel. I would like to gear this wheel up from 6rpm to 1000rpm. Before I build this machine what Hp/Kw can be expected at the 1000rpm shaft on a direct drive?. Or is there a formula for loss in gearing up?

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4. ### GoodCatWell-Known MemberEngineeringClicks Expert

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direct drive efficiency 98%
But you will definitely use the reduction gear, so you need to multiply this by the efficiency of your gearbox and the efficiency of the electric motor, then as a result you will receive a correction factor for the all of the mechanism.

You will also have wheel bearing losses, but these are very small values that can be neglected.

5. ### catcityNew Member

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Thanks John12, that site gave me the information I needed, basically if I gear it up at 4:1 It will reduce the input to a quarter each time, keep going and there would be nothing left, thanks for your interest GoodCat.

6. ### john12Well-Known MemberEngineeringClicks Expert

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So if you if you go 6x4= 24... x4 = 96... x4 = 386... x4 = 1536rpm.

So you have to gear up by 4:1 four times, so I guess your power would be reduced by the same? So that's... 26ft/lb?
I'm not really sure what that is in Metric, can you do anything useful with that?

You might be able to gear up with a greater ratio though, then you reduce the steps?

Also, you might find this video interesting, just as a related thing :

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