Like Blanchard Grinding, Surface grinding uses a magnetic chuck and an abrasive wheel to remove material. Most surface grinders have the abrasive wheel spindle in a horizontal position. Surface grinding can produce a much smoother surface that is flatter and more parallel than Blanchard Grinding. Surface grinding is ordinarily used only for removing small amounts of material at a time. Grinding permits very accurate tolerances of less than 0.001", and allows for very smooth surface finishes up to 16 microinch RMS.
There are (7) surface grinders at Withers Tool, Die and Manufacturing. One of the machines has a vertical spindle and the magnetic chuck can pivot, which works well for grinding angle shear blades and other non-parallel applications. The longest surface grinder has a magnetic chuck that is 240” long and 30” wide and has ground parts parallel within 0.0003” over that length.