Vertical-spindle grinders, or vertical double surface grinding machine, are typically used for fast & precision grinding of the two parallel surfaces of flat parts, like glass, ceramics, sapphire, metal housing, bearing, valve plate, seal, oil pump vane, piston ring,gasket Plate,retaining rings etc. 

Double or Dual Disc Grinding is a highly efficient method of removing equal stock from opposing faces of a part, normally symmetrical stock removal. The Double Disc Grinding process will also produce the highest level of Flatness and Parallelism on opposing surfaces.