
Parameter  Symbol  Unit  Value 

Effective diameter of screw (right hand)   mm  30 
Starts    5 
Pitch  p  mm  2 
Helix angle  
°
 6.056 
Contact angle  
°
 45 
Effective diameter of roller (right hand)   mm  10 
Effective diameter of nut (right hand)   mm  50 
External diameter of nut thread   mm  51.2 
Tooth number of the roller thread    20 
Number of rollers    10 
Orbital diameter of roller   mm  40 
Radius of effective ball   mm  7.0711 
Rolling coefficient of friction    0.005 
Sliding coefficient of friction    0.05 
Loss coefficient of energy    0.007 
Young’s modulus   Pa  210 × 10^{9} 
Poisson’s ratio    0.3 
