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O/T Gear Ratios

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Paul Hodgson

11-19-2003 15:40:03

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I am building a small turntable with a 4' deck to display small collectables such as lawn tractors and walk behind garden tractors gas engines. I am using an electric motor 850 rpm's with an 1 1/2" pulley to a 10" pulley, through a 60:1 ratio gear box, 3" pulley output to a 14" car rim as the final drive of the turntable top. I would like to get to approximately 2 or 3 rpm at the table. Can any one tell me the formula to calculate reduction through these points to the end at the car rim.
Thanks Paul

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Rod (NH)

11-19-2003 17:18:28

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Re: O/T Gear Ratios in reply to Paul Hodgson, 11-19-2003 15:40:03

Hi Paul,

I don't know what the diameter of the car rim would be that the belt actually rides on. However, if it were to be 14", here's my take on your final speed:

1. First reduction = 1.5" dia to 10" dia = 10/1.5 = 6.67:1 reduction

2. Second reduction = 60:1 through gear box

3. Third reduction = 3" dia to 14" dia = 14/3 = 4.67:1 reduction

4. Total reduction = 6.67 x 60 x 4.67 = 1,869:1

5. Final RPM = 850/1869 = 0.45 RPM

Once you know the actual diameter at the belt location on the car rim, just substitute it for the 14" above. It may be on the order of 10", in which case, your final RPM would be 0.64 RPM. If you want 2-3 RPM as the final speed, you will need to revise either your first or third reduction diameters if you keep the same gear box.

Rod

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Loren

11-19-2003 18:37:19

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Re: Re: O/T Gear Ratios in reply to Rod (NH), 11-19-2003 17:18:28

There you go. If you're looking for 2-3 rpm then cancel the 3" to the 14" wheel. After the 60:1 I get it at 2.125 rpm.

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jack

11-20-2003 13:36:59

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Re: Re: Re: O/T Gear Ratios in reply to Loren, 11-19-2003 18:37:19

It can't be done with your knowhow. Paulie

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Paul Hodgson

11-20-2003 16:19:05

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Re: Re: Re: Re: O/T Gear Ratios in reply to jack, 11-20-2003 13:36:59

Thanks for all the help guys I put together this morning and have arrived at a rpm of a little less than 1 as the line up on the car rim is at 13" diameter. Works good loaded jd riding lawn mower on and works real fine.
Thanks again for the help guys
Paul

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