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From: dfyler@draper.com (Don Fyler)
Subject: Re:Re:Sourch for gears, pulleys?
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Date: Wed, 20 Jul 1994 19:15:36 GMT




>> From: fontana@cis.ohio-state.edu (Mark Fontana)
>> I'm working on a project that needs a drive train allowing a
>> 1725 RPM motor to turn a 124 RPM shaft.

>We need to know how close you need to be to that exact ratio.
>1725:124 is 13.911:1 which is tough to do.
>I did get 13.824:1 with three reduction steps.

>If you use a 20 tooth grae and a 48 tooth gear you get   48:20   = 2.400:1
>If you use three of these sets in series you get 2.400^3:1  = 13.824

>So if you start with a 1725 RPM motor you get 124.78 RPM

>Is that close enough?

Try using a 16 tooth with a 69 tooth gear for the first reduction and a
31 tooth with a 100 tooth gear for the next reduction.  Less gears are 
needed and the ratio is exact.
 
