# Gearbox Gear ratio: How to get 60 rpm to 3500rpm? help please

• I
Manish
Hello I am trying to achieve 3500 rpm from 60rpm. The gear ratio I have worked out is 58:1. To minimize the size I have divided into 4 levels with the gear ratio of 2:1, 3.1, 3.1, 3,1, which rounds me up to 54:1 ratio is also ideal for me can anyone please help mw find the appropriate solution or confirm my working out or understanding of the gear ratio is appropriate please.

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The gear ratio I have worked out is 58:1.
How did you work this out? (This will give you 3480 rpm from 60 rpm. Then you change it to 54:1 which will give you 3240 rpm.)

Manish
Manish
Hello thanks for replying. Sorry I should have been more clear the 54:1 gear ratio comes from the calculation that tired to change to spur gear with 4 levels with the gear ratio of 2:1, 3.1, 3.1, 3,1 which game me 54:1.
Is this the proper way of change to spur gear ratio?

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What are the requirements?

FactChecker
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Your math of the ratios is correct. There may be other things to consider.

Manish
Manish
What are the requiremeI am
The requirements is to get 60 rpm to speed of 3200 to 35000 rpm in between those numbers.
I am trying to calculate the ideal gear ratio to change to spur gear by adding 4 level of gears instead of just two gears.
So if I have 54:1 gear ratio by changing ratio to 4 levels with the gear ratio of 2:1, 3.1, 3.1, 3,1 will work out to get me 3240rpm?

Many thanks!

Manish
Your math of the ratios is correct. There may be other things to consider.
Thank you for confirming!

Homework Helper
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The requirements is to get 60 rpm to speed of 3200 to 35000 rpm

It would have been good to say that at the beginning, yes?

Mentor
3200 to 35000 rpm
Is that a typo?

Why don't you just use a faster motor in the first place to generate the higher speed? How much power do you require at the higher speed?

Manish
It would have been good to say that at the beginning, yes?
Yes sorry. I should have explained it better.

hutchphd
Manish
Is that a typo?

Why don't you just use a faster motor in the first place to generate the higher speed? How much power do you require at the higher speed?
my input gearbox will have to be 60rpm and we are using 12v motor generator which has 3500rpm. Yes sorry it was as typo. Do you recommend any 12v dc motor generator with lower rpm which can be stopped using hand power as we know lower rpm motor cannot be stopped. If 3500 rpm is a higher rpm then what would be the efficient rpm using 60rpm gear box?

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