Biesse says the Viet Opera R is the only automated solution for sanding of MDF doors with a flat center panel, as well as the removal of cross grain scratching of solid wood doors. The Opera R also addresses the difficulties of inconsistent removal of cross grain scratch, finish quality with no swirl or check marks, proper sanding pressure to ensure no over polishing or dips, low maintenance cost and consistent finish quality from the first door to the last, the company adds.