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Screw Worm Gear Gear Axial Force Equation and Calculator

Gear Products and Suppliers | Gear Knowledge Menu

This calculator will determine the axial thrust or load applied on a screw (worm gear) thread. Reference: Schaum's Outline Machine Design. Enter desired data within the boxes, calculations should be automatic.

See bottom of webpage for: Calculate, Reset or Print (Screen).

This calculator requires a java enabled browser.

    Applied Torque    
      T = Nmm  
       
    Major Thread Radius
(Major Diameter/2)
 
      ro = mm      
           
    Thread Depth      
      h = mm    
       
 
    Minor Thread Radius  
      ri =  
         
    Mean Thread Radius
(Pitch Diameter)
   
      rm =  
 
     
       
    Effective Radial Area Contact Surface (Load Bearing)  
      rc =
 
       
    Coefficient of Friction Screw Thread and Mating (Nut) Thread  
      f =  
       
    Coefficient of Friction at Collar  
      fc =  
       
    Thread Pitch (equals thread pitch for single thread screws)  
      L = mm  
       
    Angle of Thread at Mean Radius  
      a =
   
           
       
    Thread Angle at Bearing Surface (Thread Included Angle)  
      q =  
       
    Angle Between Tangent to Tooth Profile (on the Loaded Side) and a Radial Line  
    qn =    
       
    Thread Constant  
      Rc =
 
       
       
    Load Parallel to Screw Thread Axis  
      W =
 
       
    Efficiency of the Screw Thread Mechanism (ratio of work out to work in)  
      Escrew=
 
       
       
    Torque required to advance the nut (if negative then torque needs to be applied to hold nut still)  
      Tad =
 
       

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