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Biscayne
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Join Date: Feb 2012
Posts: 5

Need Formula, Miles per Hour/Gear Reduce Ratio

02/15/2012 2:11 PM

I have a few conveyor calculation formulas but I need to determine the gearbox ratio to use on a simple project and I am at a loss. I need to drive a shuttle car at 10 m.p.h., I have a 1750rpm motor and a 12" dia. wheel driven directly off of a gear reducer. Anybody have a formula for me to use?
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SolarEagle
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#1

Re: Need formula, miles per hour/gear reducer ratio

02/15/2012 2:42 PM

Well first I would convert the mph to fpm, 5280ft * 10mph / 60min....Now you know the rpm is 1750 so you must determine the circumference of the 12" gear or pi * diameter, this will give you fpm of 12" gear at 1750 rpm...Now with simple arithmetic you can determine the difference....

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Biscayne
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Join Date: Feb 2012
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#4
In reply to #1

Re: Need formula, miles per hour/gear reducer ratio

02/15/2012 4:50 PM

Thanks alot, I calculated a 6:1 gear reducer should get me to there.
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PMoon
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#2

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/15/2012 2:55 PM

Does 75 : 1 Gear ratio compute?

Think you might need more gearing.

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WJMFIRE
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#5
In reply to #2

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/15/2012 5:23 PM

Must first convert inches to feet.

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PMoon
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#7
In reply to #5

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/16/2012 4:44 AM

Oh yea, 37.7 ft per rev. IS quite a lot. Yep ratio is 6.25

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passingtongreen
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#3

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/15/2012 4:47 PM

Well, I know that 60mph =88ft.second.

10mph = (88 feet/second/6)x60seconds = 880 feet/minute

880/π = 280.076 revolutions/minute.

1750/280.076 = 6.25 reduction.

I think.

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Wal
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#6

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/15/2012 11:35 PM

Surely, when you were qualifying for credentials that qualified you to be employed in a position requiring you to perform this calculation, you were examined and found to be competent at simple geometric modeling of physical problems......

You managed to work it out after a prompt, but....

Isn't there anyone working with you that can peer review your calculations?

CR4, peer reviewer of last resort.

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Biscayne
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#8
In reply to #6

Re: Need Formula, Miles per Hour/Gear Reduce Ratio

02/16/2012 10:19 AM

Obviously if we all had the superior intelligence of Wal this forum would be redundant. I thank the rest of you who took the time to assist a mouth breathing neanderthal with grade school arithmetic sans snarky comments.
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Users who posted comments:

Biscayne (2); passingtongreen (1); PMoon (2); SolarEagle (1); Wal (1); WJMFIRE (1)

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