Difference between revisions of "Choosing a Small Sprocket"

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It is important not to choose a sprocket too small for the smoothest power transfer.
 
It is important not to choose a sprocket too small for the smoothest power transfer.
  
(pitch /(2*TAN(PI()/ teeth ))) / (pitch /(2*SIN(PI()/ teeth )))
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Most engineering manuals suggest that 17 teeth be a minimum for high speed systems.
  
Most engineering manuals suggest that 17 teeth be a minimum for high speed systems.
 
  
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This graph shows how the lower leverage postion compares to the higher leverage postion as the sprocket rotates. (pitch /(2*TAN(PI()/ teeth ))) / (pitch /(2*SIN(PI()/ teeth )))
  
  
 
[[Image:Cog-Variance-from-round.gif]]<br>
 
[[Image:Cog-Variance-from-round.gif]]<br>
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==More Info==
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For comparison purposes, here are many of the common bicycle and motorcycle sprockets.
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[[Image:Cog-Variance-from-round-all.gif]]<br>
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==See Also==
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http://www.mathwords.com/a/area_regular_polygon.htm<br>
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http://www.mathopenref.com/polygonregulararea.html<br>
  
 
[[category:Bicycle]]
 
[[category:Bicycle]]

Latest revision as of 17:31, 27 October 2007

Chain Sprockets are effectively regular polygons. Because of this, when the small sprocket is pulling the chain a pulse is created in the system.

It is important not to choose a sprocket too small for the smoothest power transfer.

Most engineering manuals suggest that 17 teeth be a minimum for high speed systems.


This graph shows how the lower leverage postion compares to the higher leverage postion as the sprocket rotates. (pitch /(2*TAN(PI()/ teeth ))) / (pitch /(2*SIN(PI()/ teeth )))


Cog-Variance-from-round.gif


More Info

For comparison purposes, here are many of the common bicycle and motorcycle sprockets.

Cog-Variance-from-round-all.gif

See Also

http://www.mathwords.com/a/area_regular_polygon.htm
http://www.mathopenref.com/polygonregulararea.html