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  • Gear reduction

    Discussion in 'Calculations' started by SRM, Nov 24, 2014.

    1. SRM

      SRM New Member

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      Not really sure if this is the right forum to post this, but here goes... Recently I was talking about planetary gear reduction with a friend and how you could make a reduction to the point where you could almost fasten the output shaft stationary and yet be able to turn the input shaft. It seems to me there was a display at the Museum of Science and Industry in Chicago that had something like that. I looked high and low in the internet for pictures and info on this and came up empty handed. Any input would be appreciated.
      Steve
       
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    3. Lochnagar

      Lochnagar Well-Known Member

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      I haven't been to the museum of Science in Chicago - but I am going to guess that all you saw was nothing more than a very large reduction ratio of planetary reduction - which is not uncommon.

      Maxon Motors make both motors and gearboxes - and in the example below you will see a reduction of 1024:1 is obtained over a 5 stage planetary reduction gearbox.

      So with a 1024:1 reduction - if you turn the input shaft by 360 degrees (or 1 revolution) - the output shaft will only turn by 0.35 degrees. So in effect the output shaft looks as though it has hardly moved.
      You can get planetary reduction gearboxes with reductions of 10000:1 - which would mean for 1 full turn of the input shaft - the output shaft will only turn by 0.036 degrees.

      http://www.maxonmotor.com/medias/sys_master/8813565476894/14-245-EN.pdf

      Hope this helps.
       
    4. SRM

      SRM New Member

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      Thanks for the response, Lochnagar! I wish I could remember the stats on that display I saw... I may have to take a trip there again sometime.
       

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