Cutter assembly for grinding and crushing machines

A cutter assembly for mounting to one or more hammers of a rotor assembly for a grinding machine, the cutter assembly comprising:

• a base mounted to a hammer of a rotor assembly, the base having a truncated pyramid key extending upwardly and inwardly at a first angle from a surface of the base and a first center bore through the base, the truncated pyramid key surrounding the first center bore;
• a tip having a truncated pyramid keyway extending upwardly and inwardly at a second angle from a lower surface into a body of the tip, the truncated pyramid keyway configured to mate with the truncated pyramid key of the base, the tip including at least one cutting edge disposed on an end of the tip, a second center bore through the body of the tip, and a recess in the body, the recess being concentric with the center bore, the truncated pyramid keyway surrounding the second center bore;
• a truncated pyramid arrangement formed by the truncated pyramid key of the base being received within the truncated pyramid keyway of the tip, the truncated pyramid arrangement configured to distribute vertical forces and horizontal forces that impart a sheering force;
• and
• a fastener extending through the first center bore and the second center bore, the fastener being received by the hammer to secure the base and tip to the hammer, the fastener having a head being received within the recess.