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A simple formula for calculating spur gears    
        Spur gear calculator
 
Pitch circle:      
  Number of teeth Z:  
  Module:  
  Diam. Pitch Circle:  
       
Number of Teeth:      
  Outside diameter:  
  Module:  
  Number of Teeth:  
       
Ouside Diameter:      
  Number of Teeth Z:  
  Module:  
  Outside Diameter:  
       
Centre Distance:      
  Pitch Circle spur gear 1:  
  Pitch Circle spur gear 2:  
  Centre Distance:  
       
       
A simple formula for calculating internal gears.  
       
Pitch Circle:      
  Number of Teeth Z:  
  Module:  
  Diam. Pitch Circle:  
       
Internal diameter:      
  Number of Teeth Z:  
  Module:  
  Diam. Internal Teeth:  
       
Centre between pinion shaft meshing with a gear    
       
  Pitch circle ring gear:  
  Pitch circle pinion shaft:  
  Center Distance: