Roger Hess, a sales engineer at Maxon Motors, illustrates the theory and operation of Maxon’s spindle drive. 
The drive matches a brush or brushless motor with a gearhead that has incorporated two thrust bearings, allowing it to handle higher linear loads.
Click on the link below for additional information-
Maxon’s Spindle Drive Linear Actuator Product Family
For more information, please contact:      
Warren Osak
Toll Free Phone:   877-737-8698  
Toll Free Fax:       877-737-8699