Universal deburring, sanding, edge smoothing and finishing working centers with wet procession. Wet processing includes all applications with sanding belts, brushes, and other surface processing media, where the process requires coolant liquid. Such cooling liquid is utilized to keep the sanding belts clean, ideal for applications requiring tight tolerances, and avoiding heat expansion. The contaminated coolant is collected in a pan, and then it is filtered to eliminate the sludge. The filtered liquid is then recirculated in the system. The machine includes a pre-drying system for the processed workpieces made of wiping rollers and a series of air knives.