Root and stump cutter

A root and stump cutter comprising power input means, a generally vertical drive shaft having a central axis and having a first part associated with the power input means and a second part below the first part and associated with power output from the shaft, a cutter-arm array coaxially coupled with said second part of the drive shaft in rotatively driven relationship therewith, a circular array of cutters supported on said cutter arms at substantially equal radial distances from the axis of said cutter arm array, said cutters generating an imaginary surface of revolution of a given major diameter when said cutter-arm array is rotatively driven by said drive shaft, said surface of revolution being coaxial with said cutter-arm array, and a depth-of-cut bushing surrounding said drive shaft axis and vertically located close to and above said cutter-arm array and cutters and below said first part of said drive shaft, said guide bushing being centered on said drive shaft and its periphery close to said cutter arm array having a major diameter of a given dimension, said major diameter of said surface of revolution of said cutters and said major diameter of said bushing periphery differing by less than five percent.