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8_10 Brass Cleaner
Minor 1 - beginner
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Location: Shropshire
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 Posted: Tue Feb 17, 2009 1:28 pm Post subject: Meccano Gears - Reduction? |
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I'm just trying to get my head round meccano gearing.
If I use a worm how do I work out the reduction?
The way I see it, for every revolution of the worm, its mating gear will turn one tooth, so with a 57 tooth gear, the reduction is 57:1
Am I correct? |
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wart
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| Posted: Tue Feb 17, 2009 1:46 pm Post subject: gearing |
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my brian hurts
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wart
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| Posted: Tue Feb 17, 2009 1:55 pm Post subject: gearing |
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i mean brain
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Spokesmann
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Location: Plymouth, UK.
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| Posted: Tue Feb 17, 2009 4:28 pm Post subject: |
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I need my Meccano gears booklet! From memory the worm drive provides a great reduction in ratio - the most I think, it all depends on the gear/pionon driving onto it, the bigger the gear the bigger the reduction, normally divide the larger by the smaller to get the reduction. Ill see if I can locate my Meccano gears set, it has the whole lot set out in really clear english what each pinion, contrate, gear or worm drive will give when employed in any combination.
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John Chapman
SE2 - steam enthusiast 2 star
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| Posted: Tue Feb 17, 2009 4:44 pm Post subject: Re: Meccano Gears - Reduction? |
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| 8_10 Brass Cleaner wrote: |
The way I see it, for every revolution of the worm, its mating gear will turn one tooth, so with a 57 tooth gear, the reduction is 57:1
Am I correct? |
That's spot on .
Gear ratio is expressed as the number of teeth on the driven wheel divided by the number of teeth on the driving wheel. So a 60 tooth wheel driven by a thirty tooth wheel gives a reduction of 60 divided 30, i.e. 2:1
A worm gear has only 1 tooth so as you say a worm used with a 57 tooth gear gives a reduction of 57:1.
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fcrammond
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| Posted: Tue Feb 17, 2009 7:33 pm Post subject: |
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I second that 
F |
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Chris
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| Posted: Tue Feb 17, 2009 8:40 pm Post subject: |
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| Thirded (if that is a word) here. That is correct, a worm gear counts as a gear with one tooth so you get very large reductions using one. |
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8_10 Brass Cleaner
Minor 1 - beginner
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Joined: 12 Oct 2007
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Location: Shropshire
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| Posted: Tue Feb 17, 2009 9:46 pm Post subject: |
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| Chris wrote: | | Thirded (if that is a word) here. That is correct, a worm gear counts as a gear with one tooth so you get very large reductions using one. |
Ta gents, thanks for confirming that. Did meccano make double lead worms? |
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