Patent ID: 8137162

Claim:
A machine for polishing a plurality of wafers, comprising: a table base comprising a round platen adapted for rotation at a selected rate of platen rotation and in a selected direction of platen rotation; and a lid formed with a rectangular aperture, comprising: a head moving assembly comprising four head assemblies rotatably attached in a square pattern to said head moving assembly, wherein each of said four head assemblies is adapted to hold at least one wafer and all of said four head assemblies rotate at a same head assembly rate of rotation and in a same head assembly direction of rotation; a head assembly drive motor attached to said head moving assembly and rotationally coupled to said four head assemblies, wherein a rotation of said head assembly drive motor causes a corresponding rotation of said four head assemblies at said rate of head assembly rotation and said head assembly direction of rotation; and a head moving assembly drive motor attached to said lid and mechanically coupled to said head moving assembly, wherein said head moving assembly is slidably attached to said lid and said head moving assembly translates within said aperture formed in said lid in reciprocating linear motion in a plane parallel to an upper surface of said platen.