Viotto Vertical Disc Grinders are available in standard models with grinding wheel diameters ranging from 14" - 36". Our Vertical Grinders offer ultimate precision, productivity, and flexibility in disc type surface grind......Viotto Vertical Disc Grinders are available in standard models with grinding wheel diameters ranging from 14" - 36". Our Vertical Grinders offer ultimate precision, productivity, and flexibility in disc type surface grinding. Our Viotto Vertical Disc Grinders are available in both single and double disc versions, and with a variety of feed systems to suit the application: Rotary Interpolated Planetary Oscillation Reciprocation Special/Combination