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DBH Calculator

Sizing DBH Disk Brake Brake for Unwind Tension Control
                 
 
    INPUT      
         
             
Enter Tension pli    
(see chart below if needed)        
         
               
Roll Diameter: in.    
             
             
             
  Web width   in.    
             
             
             
Core diameter in.    
             
         
               
Web (Linear) Speed ft/min      
               
           
               
Calculate    
     
    Tension Value Chart  
CALCULATED RESULTS  
     
            Foil .001 inches thick   1  
        Foil .002 inches thick   2  
        Mylar .0005 inches thick 0.25  
Tension pli   Mylar .001 inches thick 0.75  
            Mylar .002 inches thick 1.5  
Maximum Torque lb ft
  Polyethylene .001 inches thick 0.25  
            Polyethylene .002 inches thick 0.5  
Slip RPM (at full roll) rpm   Acetate .0005 inches thick 0.25  
        Acetate .001 inches thick 0.5  
Heat Dissipated W   Acetate .002 inches thick 1  
     
    Polystyrene .0005 inches thick 0.5  
Maximum RPM rpm   Polystyrene .001 inches thick 1  
            Polystyrene .002 inches thick 2  
        Cellophane .001 inches thick 0.5  
  Wax Paper .001 inches thick 1  
  Wax Paper .002 inches thick 2  
The proper size brake must....   Newspaper .002 inches thick 0.25  
        Newspaper .003 inches thick 0.75  
have sufficient torque     Kraftpaper 0.005 inches thick 1.5  
be able to dissipate the heat     Kraftpaper 0.01 inches thick 4  
not run above rated speed     Paperboard 8 pt.   3  
      Paperboard 12 pt.   4  
        Paperboard 15 pt.   5  
The following brakes meet your specifications:   Paperboard 20 pt.   7  
  Paperboard 25 pt.   9  
  Paperboard 30 pt.   1  
  Paper 15 lbs./ream   0.5  
  Paper 20 lbs./ream   0.75  
  Paper 30 lbs./ream   1  
  Paper 40 lbs./ream   1.5  
  Paper 60 lbs./ream   2.5  
  Paper 100 lbs./ream   4  
       
     
Choose the smallest from above and verify on graphs below  
     
     
     
Sizing Air Brake for Cycling or Controlled Starting or Stopping  
         
    INPUT      
       
         
 
Enter Tension pli  
(see chart above if needed)        
         
               
Roll Diameter: in.    
             
             
             
  Web width   in.    
             
             
             
Core diameter in.    
             
         
             
Web (Linear) Speed ft/min    
             
         
             
Roll Weight: lbs.    
             
         
             
Time to stop the load s    
             
             
Calculate    
     
     
CALCULATED RESULTS    
             
         
Tension pli    
           
Torque (due to unwinding) lb ft  
           
Slip RPM (at full roll) rpm    
         
 
Heat Dissipated W  
     
       
Maximum RPM rpm  

   

 
Inertia lbft2  
           
Torque (due to inertia) lb ft  
(controlled deceleration conditions)      
           
Limiting torque lb ft  
           
 
The proper size brake must....  
     
have sufficient torque    
be able to dissipate the heat    
not run above rated speed    
   
The following brakes meet your specifications:  
   
   
   
   
   
   
   
   
 
Choose the smallest from above and verify on graph below  

 
 
 
 
 
 
   
 
 
 
 
 

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