Automatic bur grinding machine

A machine for grinding a multi-tooth bur automatically and comprising in combination, a base, a table supported for rotation about an axis perpendicular to said table, a plurality of grinding units supported upon said base adjacent the periphery of said table, a plurality of work heads mounted upon said table and having axes extending substantially radially from the axis of said table, said work heads and grinding units being spaced substantially even distances circumferentially around the periphery of said table, whereby when said table is positioned in operative relationship relative to said grinding units said work heads will be aligned radially therewith to effect grinding of bur blanks, said work heads each supporting a collet arranged to securely and accurately position the head of a bur blank in position to be ground by rotatable grinding discs supported upon said grinding units for movement toward and from said blanks, and means engageable with said work heads and operable to move said work heads and the collets thereon radially outward during the grinding of bur heads supported by said collets at said grinding units, means operable automatically to index said work heads and collets when positioned adjacent said respective grinding units to grind a series of circumferentially arranged grooves in the heads of said burs to form corresponding teeth thereon, and power means connected to said table and operable to advance said table and the work heads supported thereby sequentially and respectively to said grinding units, whereby a plurality of burs are ground simultaneously by said machine.