Jun 17, 2010· Mattison Grinding from 36" x 144" Mattison Plano surface grinder, 72" x 180" with a blending width of 80"and length of 260", the Plano is one of the largest grinding machines of its kind in America; Capable of holding tolerances of .001; Surface Grinding with 32 micro and better finishes; Blanchard Grinding with 63 micro and better finishes