The Barnes Ball Screw Reconditioning Process
 
 

Fig. 4 - Visual inspection of worn nut.

 

Fig. 5 - Optical checking of worn leadscrew thread radius to determine radius wear and deformation.

 

 

 

 

Fig. 6 - Grinding leadscrew ball raceway in a Matrix 70 thread grinder.

 

Fig. 7 - Straightening of ball leadscrew before lead check.

 

 

 

 

Fig. 8 - Checking thread lead in master V-block.

 

Fig. 9 - Pre-cutting internal ball thread raceway in new ball nut before heat treatment.
     

Fig. 10 - Inspecting timing of ball thread return holes with ball thread raceway before heat treatment.

  

Fig. 11 - Checking hardness on ball nuts after heat treatment.
     

Fig. 12 - Grinding ball thread raceway in new ball nut.

  

Fig. 13 - Optical checking of regound leadscrew thread radius to new engineered specifications.
     

Fig. 14 - Inspecting radial clearance to determine ball contact angle.

  

Fig. 15 - Checking drag force and running condition on flange-type nut assembly.
     

Fig. 16 - Checking journal concentricity to pitch diameter of ball screw, by rotating screw through nut.

  

Fig. 17 - Testing axial deflection between nut and ball screw to determine point at which preload is relieved.
     

Fig. 18 - Checking a flanged nut for squareness to the screw axis, and journal concentricity to the screw major diameter.

  

Fig. 19 - Checking leadscrew centerline, and centerline angularity on a reconditioned leadscrew.