Method and apparatus for grinding rotors for hydraulic motors and apparatus therefor

Abstract

A fixture for selectively locating and retaining hydraulic gerotor rotors in position in respect to a grinding wheel, the fixture clamping the rotor between two oversized positioning rolls located in rotor lobe valleys on opposite sides of the rotor.

1 - 59 . (canceled)  
   
   
       60 . An apparatus for positioning a member having a segment of a developed surface, 
 the apparatus including a positioning fixture and said positioning fixture contacting the segment at only two points to position and retain the member in the apparatus.    
   
   
       61 - 65 . (canceled)  
   
   
       66 . A contact for retaining a rotor in respect to an arbor, the rotor having a non-circular external developed surface with at least two segments with a valley therebetween, the segments having a valley radius and an end surface, 
 the contact surface comprising a washer, said washer being smaller than the valley radius of the rotor, and said washer being in contact with the end surface of the rotor to retain it in respect to the arbor.